b=383960, Cairo 1.5.x: fix XLIB_XRENDER feature

configure.in

@@ -6958,6 +6958,7 @@ if test "$MOZ_SVG" -o "$MOZ_ENABLE_CANVAS" -o "$MOZ_ENABLE_CAIRO_GFX" ; then
        # Define macros for cairo-features.h
        if test "$MOZ_X11"; then
            XLIB_SURFACE_FEATURE="#define CAIRO_HAS_XLIB_SURFACE 1"
+           XLIB_XRENDER_SURFACE_FEATURE="#define CAIRO_HAS_XLIB_XRENDER_SURFACE 1"
            PS_SURFACE_FEATURE="#define CAIRO_HAS_PS_SURFACE 1"
            PDF_SURFACE_FEATURE="#define CAIRO_HAS_PDF_SURFACE 1"
            FT_FONT_FEATURE="#define CAIRO_HAS_FT_FONT 1"
@@ -7004,6 +7005,7 @@ if test "$MOZ_SVG" -o "$MOZ_ENABLE_CANVAS" -o "$MOZ_ENABLE_CAIRO_GFX" ; then
        AC_SUBST(PDF_SURFACE_FEATURE)
        AC_SUBST(SVG_SURFACE_FEATURE)
        AC_SUBST(XLIB_SURFACE_FEATURE)
+       AC_SUBST(XLIB_XRENDER_SURFACE_FEATURE)
        AC_SUBST(QUARTZ_SURFACE_FEATURE)
        AC_SUBST(NQUARTZ_SURFACE_FEATURE)
        AC_SUBST(XCB_SURFACE_FEATURE)

gfx/cairo/cairo/src/cairo-features.h.in

@@ -65,6 +65,8 @@
 
 @XLIB_SURFACE_FEATURE@
 
+@XLIB_XRENDER_SURFACE_FEATURE@
+
 @QUARTZ_SURFACE_FEATURE@
 
 @XCB_SURFACE_FEATURE@