gprofng: fix build with -mx32

gprofng: fix build with -mx32

gprofng/ChangeLog
2022-05-26  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/28983
	* libcollector/libcol_util.h (__collector_getsp, __collector_getfp,
	__collector_getpc): Adapt for build with -mx32
	* libcollector/heaptrace.c: Fix -Wpointer-to-int-cast warnings.
	* libcollector/hwprofile.h: Likewise.
	* libcollector/mmaptrace.c: Likewise.
	* libcollector/synctrace.c: Likewise.
	* libcollector/unwind.c: Likewise.