Update cairo version requirement to 0.3.0. r+sr=bryner

configure.in

@@ -90,7 +90,7 @@ PERL_VERSION=5.004
 QT_VERSION=3.2.0
 QT_VERSION_NUM=320
 LIBART_VERSION=2.3.4
-CAIRO_VERSION=0.1.17
+CAIRO_VERSION=0.3.0
 GTK2_VERSION=1.3.7
 MAKE_VERSION=3.78
 WINDRES_VERSION=2.14.90
@@ -5653,7 +5653,7 @@ MOZ_CAIRO_CFLAGS=
 MOZ_CAIRO_LIBS=
 
 if test "$MOZ_SVG_RENDERER_CAIRO" -o "$MOZ_ENABLE_CAIRO" ; then
-   PKG_CHECK_MODULES(CAIRO, cairo >= $CAIRO_VERSION)
+   PKG_CHECK_MODULES(CAIRO, cairo = $CAIRO_VERSION)
    MOZ_CAIRO_CFLAGS=$CAIRO_CFLAGS
    MOZ_CAIRO_LIBS=$CAIRO_LIBS
 fi