wvstreams: Pass -fPIC to CFLAGS when building PIC objects

The argp bundled dependency which is linked to the libwvutils.so
shared library, wasn't built with -fPIC.
MIPS will refuce to link a non-PIC library with a shared one.

We fix this problem by appending -fPIC to CFLAGS and build all the
shared objects with -fPIC.

[Peter: use +=]
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/wvstreams/wvstreams.mk

@@ -27,6 +27,10 @@ WVSTREAMS_CONF_OPT += \
 # needed for openssl detection when statically linking (as ssl needs lz)
 WVSTREAMS_CONF_ENV += LIBS=-lz
 
+ifneq ($(BR2_PREFER_STATIC_LIB),y)
+	WVSTREAMS_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -fPIC"
+endif
+
 ifeq ($(BR2_PACKAGE_DBUS),y)
 	WVSTREAMS_DEPENDENCIES += dbus
 	WVSTREAMS_CONF_OPT += --with-dbus