MT#55283 add PIE build flags

Fixes:

/bin/ld: dynamic STT_GNU_IFUNC symbol `s16_mix_in.lto_priv.234' with pointer equality in `/tmp/ccDfEly2.ltrans2.ltrans.o' can not be used when making an executable; recompile with -fPIE and relink with -pie

closes #1846

Change-Id: Ic31f2e064e88bc931f3438eff7b362ad611b7d84
(cherry picked from commit d9c27af99d)
(cherry picked from commit c724e84873)

lib/common.Makefile

@@ -1,5 +1,8 @@
 include ../lib/lib.Makefile
 
+CFLAGS += -fPIE
+LDFLAGS += -pie
+
 all:
 	$(MAKE) $(TARGET) $(MANS)
 

t/Makefile

@@ -254,10 +254,10 @@ PRELOAD_CFLAGS += -D_GNU_SOURCE -std=c11
 PRELOAD_LIBS += -ldl
 
 tests-preload.so:	tests-preload.c
-	$(CC) $(PRELOAD_CFLAGS) -o $@ -shared -fPIC $< $(LDFLAGS) $(PRELOAD_LIBS)
+	$(CC) $(PRELOAD_CFLAGS) -o $@ -shared -fPIC $< $(PRELOAD_LIBS)
 
 time-fudge-preload.so:	time-fudge-preload.c
-	$(CC) $(PRELOAD_CFLAGS) -o $@ -shared -fPIC $< $(LDFLAGS) $(PRELOAD_LIBS)
+	$(CC) $(PRELOAD_CFLAGS) -o $@ -shared -fPIC $< $(PRELOAD_LIBS)
 
 spandsp_send_fax_pcm.c:	spandsp_logging.h
 spandsp_send_fax_t38.c:	spandsp_logging.h