gprofng: 32018 Compilation of binutils 2.43 failed on CentOS 6

strchr is redefined as a macro in /usr/include/bits/string.h on CentOS 6/7.
In this case, we may not use our CALL_UTIL macro for strchr.
Use __collector_strchr instead of "CALL_UTIL (strchr)".

gprofng/ChangeLog
2024-07-28  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR 32018
	* libcollector/hwprofile.c (open_experiment): Use __collector_strchr.