cairo: disable LTO

Should fix part of #403.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

src/cairo-3-lto.patch

@@ -0,0 +1,46 @@
+This file is part of MXE.
+See index.html for further information.
+
+Add an option to disable LTO which breaks static linking.
+
+diff -Naur cairo-1.12.16/build/configure.ac.warnings cairo-1.12.16.new/build/configure.ac.warnings
+--- cairo-1.12.16/build/configure.ac.warnings	2013-08-26 08:07:21.000000000 -0700
++++ cairo-1.12.16.new/build/configure.ac.warnings	2014-05-08 20:08:11.296371571 -0700
+@@ -36,14 +36,30 @@
+ dnl We also abuse the warning-flag facility to enable other compiler
+ dnl options.  Namely, the following:
+ 
+-dnl -flto working really needs a test link, not just a compile
++AC_ARG_ENABLE(lto,
++  AS_HELP_STRING([--enable-lto],
++                 [Enable link-time optimization.]), [
++if test "x$enableval" = "xyes"; then
++    dnl -flto working really needs a test link, not just a compile
+ 
+-safe_MAYBE_WARN="$MAYBE_WARN"
+-MAYBE_WARN="$MAYBE_WARN -flto"
+-AC_TRY_LINK([],[
+-	int main(int argc, char **argv) { return 0; }
+-],[],[
+-	MAYBE_WARN="$safe_MAYBE_WARN"
++    safe_MAYBE_WARN="$MAYBE_WARN"
++    MAYBE_WARN="$MAYBE_WARN -flto"
++    AC_TRY_LINK([],[
++	    int main(int argc, char **argv) { return 0; }
++    ],[],[
++	    MAYBE_WARN="$safe_MAYBE_WARN"
++    ])
++fi
++], [
++    dnl -flto working really needs a test link, not just a compile
++
++    safe_MAYBE_WARN="$MAYBE_WARN"
++    MAYBE_WARN="$MAYBE_WARN -flto"
++    AC_TRY_LINK([],[
++	    int main(int argc, char **argv) { return 0; }
++    ],[],[
++	    MAYBE_WARN="$safe_MAYBE_WARN"
++    ])
+ ])
+ 
+ MAYBE_WARN="$MAYBE_WARN -fno-strict-aliasing -fno-common"

src/cairo.mk

@@ -21,6 +21,7 @@ define $(PKG)_BUILD
     $(SED) -i 's,^\(Libs:.*\),\1 @CAIRO_NONPKGCONFIG_LIBS@,' '$(1)/src/cairo.pc.in'
     cd '$(1)' && ./configure \
         $(MXE_CONFIGURE_OPTS) \
+        --disable-lto \
         --disable-gtk-doc \
         --disable-test-surfaces \
         --disable-gcov \