Update Makefile.am

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: airween

Makefile.am

@@ -50,7 +50,7 @@ cppcheck:
 	    -I @APR_INCLUDEDIR@ \
 	    -I @APU_INCLUDEDIR@ \
 	    --suppressions-list=./tests/cppcheck_suppressions.txt \
-	    --suppress=syntaxError:/usr/include/apr-1.0/* \
+	    --suppress=syntaxError:@APR_INCLUDEDIR@/* \
 	    --inline-suppr \
 	    --inconclusive \
 	    --template="warning: {file},{line},{severity},{id},{message}" \