gprofng: fix build with --enable-pgo-build=lto

gprofng/ChangeLog
2022-10-04  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/29579
	* libcollector/dispatcher.c: Fix the symbol version in SYMVER_ATTRIBUTE.
	* libcollector/iotrace.c: Likewise.
	* libcollector/linetrace.c: Likewise.
	* libcollector/mmaptrace.c: Likewise.
	* libcollector/synctrace.c: Likewise.