ficl: add missing -fPIC

fix http://autobuild.buildroot.net/results/dec/dec926ad7d7880c385835ba7b380dd41fd7f3762/

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ficl/ficl.mk

@@ -39,7 +39,7 @@ endif
 
 define FICL_BUILD_CMDS
 	$(MAKE) -C $(@D) -f Makefile.linux $(TARGET_CONFIGURE_OPTS) \
-		CPPFLAGS="$(TARGET_CPPFLAGS) -I. -Dlinux" $(FICL_BUILD_TARGETS)
+		CFLAGS="$(TARGET_CFLAGS) -fPIC -I. -Dlinux" CPPFLAGS="" $(FICL_BUILD_TARGETS)
 endef
 
 define FICL_INSTALL_STAGING_CMDS