fix(callgrind/tests): prevent printf inlining in inline tests

Add -D_FORTIFY_SOURCE=0 to inline test CFLAGS to prevent glibc from
providing inline wrappers for printf via stdio2.h. This ensures the
tests only capture the intended inline function calls.

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: art049

callgrind/tests/Makefile.am

@@ -34,7 +34,8 @@ AM_CFLAGS   += $(AM_FLAG_M3264_PRI)
 AM_CXXFLAGS += $(AM_FLAG_M3264_PRI)
 
 # Inline tests need -O2 to enable inlining and -g for debug info
-inline_samefile_CFLAGS = $(AM_CFLAGS) -O2 -g
-inline_crossfile_CFLAGS = $(AM_CFLAGS) -O2 -g
+# Use -D_FORTIFY_SOURCE=0 to prevent glibc from inlining printf and other stdio functions
+inline_samefile_CFLAGS = $(AM_CFLAGS) -O2 -g -D_FORTIFY_SOURCE=0
+inline_crossfile_CFLAGS = $(AM_CFLAGS) -O2 -g -D_FORTIFY_SOURCE=0
 
 threads_LDADD = -lpthread