stlport: Force building PIC code

Required for gcc 4.7

Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
diff --git a/Android.mk b/Android.mk
index a1bdb50..560a630 100755
--- a/Android.mk
+++ b/Android.mk
@@ -34,8 +34,8 @@
 	src/c_locale.c \
 	src/cxa.c \
 
-libstlport_cflags := -D_GNU_SOURCE
-libstlport_cppflags := -fuse-cxa-atexit
+libstlport_cflags := -D_GNU_SOURCE -fPIC
+libstlport_cppflags := -fuse-cxa-atexit -fPIC
 
 ##########################################
 include $(CLEAR_VARS)