Perl interface: add build-time configuration to allow building with -fPIC
Perl interface: add build-time configuration to allow building with -fPIC

On x86-64 it seems that Git.xs does not link without compiling
the main git objects with -fPIC.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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