MT#55283 add missing CPPFLAGS_DEFAULT

Change-Id: Id6e11ac310594df3eebeb0ff3ab266c99c2e2eca
(cherry picked from commit 3df016e354)
(cherry picked from commit 2ee97366de)

t/Makefile

@@ -368,10 +368,10 @@ PRELOAD_CFLAGS += -D_GNU_SOURCE -std=c11
 PRELOAD_LIBS += -ldl
 
 tests-preload.so:	tests-preload.c
-	$(CC) $(PRELOAD_CFLAGS) ${CFLAGS_DEFAULT} -o $@ -shared -fPIC $(LDFLAGS_DEFAULT) $< $(PRELOAD_LIBS)
+	$(CC) $(PRELOAD_CFLAGS) ${CFLAGS_DEFAULT} ${CPPFLAGS_DEFAULT} -o $@ -shared -fPIC $(LDFLAGS_DEFAULT) $< $(PRELOAD_LIBS)
 
 time-fudge-preload.so:	time-fudge-preload.c
-	$(CC) $(PRELOAD_CFLAGS) ${CFLAGS_DEFAULT} -o $@ -shared -fPIC $(LDFLAGS_DEFAULT) $< $(PRELOAD_LIBS)
+	$(CC) $(PRELOAD_CFLAGS) ${CFLAGS_DEFAULT} ${CPPFLAGS_DEFAULT} -o $@ -shared -fPIC $(LDFLAGS_DEFAULT) $< $(PRELOAD_LIBS)
 
 spandsp_send_fax_pcm.c:	../lib/spandsp_logging.h
 spandsp_send_fax_t38.c:	../lib/spandsp_logging.h