pango: Disable Wimplicit-fallthrough as error

Clang is quite a lot more stricter and ends up finding more cases,
these are code format warnings so its safer to disable them here.

(From OE-Core rev: 735eb7f3e0d14be50b17e85af6e6da7fc2921924)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/pango/pango_1.44.7.bb

@@ -32,6 +32,10 @@ PACKAGECONFIG[thai] = ",,libthai"
 GTKDOC_MESON_OPTION = "gtk_doc"
 GIR_MESON_OPTION = 'introspection'
 
+do_configure_prepend_toolchain-clang() {
+    sed -i -e "/Werror=implicit-fallthrough/d" ${S}/meson.build
+}
+
 LEAD_SONAME = "libpango-1.0*"
 
 FILES_${PN} = "${bindir}/* ${libdir}/libpango*${SOLIBS}"