tiff: remove $(FPIC) from TARGET_CFLAGS

tiff already makes sure that the compiler emits position-independent
code. Adding $(FPIC) makes no difference. In addition the tiff build
system puts its own flag behind the CFLAGS, overriding whatever was set
before.

Also with $(FPIC) in CFLAGS even the tiff utils get compiled with PIC,
which us undesirable.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

libs/tiff/Makefile

@@ -58,8 +58,6 @@ $(call Package/tiff/Default)
   DEPENDS:=+libtiff
 endef
 
-TARGET_CFLAGS += $(FPIC)
-
 define Build/Configure
 	$(call Build/Configure/Default, \
 		$(if $(CONFIG_PACKAGE_libtiffxx), \