cairo: fix m68k uclinux compile

The GCC manual suggest when getting:
relocation truncated to fit: R_68K_GOT16O foobar
to use -mxgot.

Fixes:
  http://autobuild.buildroot.net/results/31a488316fe3c14729a6dd9259205f8530684cab/
  http://autobuild.buildroot.net/results/dc6b899e3e502d65b2cf2f6d922a4f63857edf82/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/cairo/cairo.mk

@@ -12,6 +12,11 @@ CAIRO_SITE = http://cairographics.org/releases
 CAIRO_INSTALL_STAGING = YES
 CAIRO_AUTORECONF = YES
 
+# relocation truncated to fit: R_68K_GOT16O
+ifeq ($(BR2_m68k_cf),y)
+CAIRO_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -mxgot"
+endif
+
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),)
 CAIRO_CONF_ENV += CPPFLAGS="$(TARGET_CPPFLAGS) -DCAIRO_NO_MUTEX=1"
 endif