configure: avoid some code repetitions thanks to m4_{push,pop}def
configure: avoid some code repetitions thanks to m4_{push,pop}def

This change is just cosmetic, and should cause no semantic change, nor
any change in the generated configure script.

Signed-off-by: Stefano Lattarini <efd5b15649c943c26fb76b69835a0b145831b6a9@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git