perl/Makefile.PL: detect MakeMaker versions incompatible with DESTDIR
perl/Makefile.PL: detect MakeMaker versions incompatible with DESTDIR

It appears that ExtUtils::MakeMaker versions older than 6.11 do not
implement the DESTDIR mechanism.  So add a test to the generated perl.mak
to detect when DESTDIR is used along with a too old ExtUtils::MakeMaker and
abort with a message suggesting the use of NO_PERL_MAKEMAKER.

Signed-off-by: Brandon Casey <77bc9a9984e6786c5799d7a71768cf023120ef76@nrlssc.navy.mil>
Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

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