Add missing include

This fixes these warnings:

/home/pswartva/chameleon/build/compute/sgram.c: In function ‘CHAMELEON_sgram_WS_Alloc’:
/home/pswartva/chameleon/build/compute/sgram.c:56:15: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration]
   56 |     options = calloc( 1, sizeof(struct chameleon_psgram_s) );
      |               ^~~~~~
/home/pswartva/chameleon/build/compute/sgram.c:56:15: warning: incompatible implicit declaration of built-in function ‘calloc’
/home/pswartva/chameleon/build/compute/sgram.c:20:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘calloc’
   19 | #include "control/common.h"
  +++ |+#include <stdlib.h>
   20 | 
/home/pswartva/chameleon/build/compute/sgram.c: In function ‘CHAMELEON_sgram_WS_Free’:
/home/pswartva/chameleon/build/compute/sgram.c:101:5: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
  101 |     free( ws );
      |     ^~~~
/home/pswartva/chameleon/build/compute/sgram.c:101:5: warning: incompatible implicit declaration of built-in function ‘free’
/home/pswartva/chameleon/build/compute/sgram.c:101:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
/home/pswartva/chameleon/build/compute/cgram.c: In function ‘CHAMELEON_cgram_WS_Alloc’:
/home/pswartva/chameleon/build/compute/cgram.c:56:15: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration]
   56 |     options = calloc( 1, sizeof(struct chameleon_pcgram_s) );
      |               ^~~~~~
/home/pswartva/chameleon/build/compute/cgram.c:56:15: warning: incompatible implicit declaration of built-in function ‘calloc’
/home/pswartva/chameleon/build/compute/cgram.c:20:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘calloc’
   19 | #include "control/common.h"
  +++ |+#include <stdlib.h>
   20 | 
/home/pswartva/chameleon/build/compute/cgram.c: In function ‘CHAMELEON_cgram_WS_Free’:
/home/pswartva/chameleon/build/compute/cgram.c:101:5: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
  101 |     free( ws );
      |     ^~~~
/home/pswartva/chameleon/build/compute/cgram.c:101:5: warning: incompatible implicit declaration of built-in function ‘free’
/home/pswartva/chameleon/build/compute/cgram.c:101:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
/home/pswartva/chameleon/build/compute/zgram.c: In function ‘CHAMELEON_zgram_WS_Alloc’:
/home/pswartva/chameleon/build/compute/zgram.c:56:15: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration]
   56 |     options = calloc( 1, sizeof(struct chameleon_pzgram_s) );
      |               ^~~~~~
/home/pswartva/chameleon/build/compute/zgram.c:56:15: warning: incompatible implicit declaration of built-in function ‘calloc’
/home/pswartva/chameleon/build/compute/zgram.c:20:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘calloc’
   19 | #include "control/common.h"
  +++ |+#include <stdlib.h>
   20 | 
/home/pswartva/chameleon/build/compute/zgram.c: In function ‘CHAMELEON_zgram_WS_Free’:
/home/pswartva/chameleon/build/compute/zgram.c:101:5: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
  101 |     free( ws );
      |     ^~~~
/home/pswartva/chameleon/build/compute/zgram.c:101:5: warning: incompatible implicit declaration of built-in function ‘free’
/home/pswartva/chameleon/build/compute/zgram.c:101:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’
/home/pswartva/chameleon/build/compute/dgram.c: In function ‘CHAMELEON_dgram_WS_Alloc’:
/home/pswartva/chameleon/build/compute/dgram.c:56:15: warning: implicit declaration of function ‘calloc’ [-Wimplicit-function-declaration]
   56 |     options = calloc( 1, sizeof(struct chameleon_pdgram_s) );
      |               ^~~~~~
/home/pswartva/chameleon/build/compute/dgram.c:56:15: warning: incompatible implicit declaration of built-in function ‘calloc’
/home/pswartva/chameleon/build/compute/dgram.c:20:1: note: include ‘<stdlib.h>’ or provide a declaration of ‘calloc’
   19 | #include "control/common.h"
  +++ |+#include <stdlib.h>
   20 | 
/home/pswartva/chameleon/build/compute/dgram.c: In function ‘CHAMELEON_dgram_WS_Free’:
/home/pswartva/chameleon/build/compute/dgram.c:101:5: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
  101 |     free( ws );
      |     ^~~~
/home/pswartva/chameleon/build/compute/dgram.c:101:5: warning: incompatible implicit declaration of built-in function ‘free’
/home/pswartva/chameleon/build/compute/dgram.c:101:5: note: include ‘<stdlib.h>’ or provide a declaration of ‘free’