ac: fail shader compilation if libelf is replaced by an incompatible version

ac: fail shader compilation if libelf is replaced by an incompatible version

UE4Editor has this issue.

This commit prevents hangs (release build) or assertion failures (debug
build). It doesn't fix the editor, but catastrophic scenarios are
prevented.

Cc: 17.1 17.2 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
(cherry picked from commit 4630ede1021d49c610de1274dc9d1006b843e46b)