Fix hipblas configure to allow compiling when hipblas isn't found
- Disable hipblas examples when hipblas isn't found
- Only check rocblas.h and rocblas.so when compiling for AMD target
- Add missing header include of
cublas.hwhen compiling for Nvidia target - Reactivate
example/multtest as it was ported to HIP but the compilation for HIP was disabled during some previous rebase to master - Fix logic of
AC_CHECK_for hip and hibblas