fix: add lapacke header for dlamch calls.

Might cause warning/error due to wrong precision setting in testings
(e.g. "WARNING: accuracy must be > 0.").

testing/chameleon_ztesting.c

@@ -25,6 +25,7 @@
  *
  */
 #include "testings.h"
+#include "coreblas/lapacke.h"
 
 testing_options_t options;
 

testing/vendor_ztesting.c

@@ -19,6 +19,7 @@
  *
  */
 #include "testings.h"
+#include "coreblas/lapacke.h"
 
 testing_options_t options;