Fix 32097 Warnings when building gprofng with Clang

gprofng/ChangeLog
2024-09-03  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>.

	PR gprofng/32097
	* common/hwcdrv.c: Fix -Wempty-body warnings.
	* common/hwcentry.h: Fix -Wdeprecated-non-prototype warnings.
	* common/hwctable.c: Fix -Wdeprecated-non-prototype warnings.
	* libcollector/collector.c: Likewise.
	* libcollector/collector.h: Likewise.
	* libcollector/collectorAPI.c: Likewise.
	* libcollector/dispatcher.c: Likewise.
	* libcollector/iotrace.c: Likewise.
	* libcollector/libcol_util.c: Fix -Wunused-but-set-variable warnings.
	* libcollector/libcol_util.h: Remove unused declarations.
	* libcollector/linetrace.c: Fix -Wdeprecated-non-prototype warnings.
	* src/BaseMetricTreeNode.h: Fix -Wunused-private-field warnings.
	* src/Dbe.cc: Fix -Wself-assign warnings.
	* src/DbeSession.cc: Fix -Wunused-but-set-variable warnings.
	* src/Disasm.cc: Fix -Wunused-const-variable warnings.
	* src/Experiment.cc: Fix -Wunused-private-field warnings.
	* src/HashMap.h: Fix -Wself-assign warnings.
	* src/IOActivity.h: Fix -Wunused-private-field warnings.
	* src/collctrl.cc: Fix -Wself-assign, -Wparentheses-equality warnings.
	* src/collctrl.h: Fix -Wunused-private-field warnings.
	* src/collector_module.h: Fix -Wdeprecated-non-prototype warnings.
	* src/gp-display-src.cc: Fix -Wunused-private-field warnings.
	* src/gp-print.h: Fix -Wheader-guard warnings.
	* src/hwc_intel_icelake.h: Fix -Winitializer-overrides warnings.
	* src/util.cc: Fix -Wunused-but-set-variable warnings.