more c99 updates

This commit does two things. It removes checks for C99 required
headers (stdlib.h, string.h, signal.h, etc). Additionally it removes
definitions for required C99 types (intptr_t, int64_t, int32_t, etc).

Signed-off-by: Nathan Hjelm <hjelmn@me.com>

ompi/mpi/java/c/mpi_Intracomm.c

@@ -47,9 +47,7 @@
 #include "ompi_config.h"
 
 #include <stdlib.h>
-#ifdef HAVE_STRING_H
 #include <string.h>
-#endif
 #ifdef HAVE_TARGETCONDITIONALS_H
 #include <TargetConditionals.h>
 #endif