mesa: Add missing switch break in invalidate_framebuffer_storage()

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70411
Cc: "9.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
i965: Don't copy prop source mods into instructions that can't take them.
configure.ac: Don't check for cross compiling.

Dead since c845140a.
configure.ac: Don't check for awk, grep, nm.

Not used since d53901c6.