Use the HDF5_CPPFLAGS set by the AX_LIB_HDF5 macro

These are needed when the environment CFLAGS do not point at the HDF5 include directory. Use CPPFLAGS as CFLAGS is not set


Former-commit-id: cd1da96aeecf3e8abce21946d0b1168ae6159e53

examples/Makefile.am

@@ -20,7 +20,7 @@
 MYFLAGS = -DTIMER
 
 # Add the source directory and debug to CFLAGS
-AM_CFLAGS = -Wall -Werror -I../src -DCPU_TPS=2.67e9
+AM_CFLAGS = -Wall -Werror -I../src -DCPU_TPS=2.67e9 $(HDF5_CPPFLAGS)
 
 AM_LDFLAGS =
 

src/Makefile.am

@@ -17,7 +17,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Add the debug flag to the whole thing
-AM_CFLAGS = -DTIMER -DCOUNTER -DCPU_TPS=2.30e9
+AM_CFLAGS = -DTIMER -DCOUNTER -DCPU_TPS=2.30e9 $(HDF5_CPPFLAGS)
 
 # Assign a "safe" version number
 AM_LDFLAGS = $(LAPACK_LIBS) $(BLAS_LIBS) $(HDF5_LDFLAGS) -version-info 0:0:0 # -fsanitize=address