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make non-zero exit from Makefile.PL fatal in make_ext.pl
A non-zero exit is fatal according to
http://www.nntp.perl.org/group/perl.qa/2008/08/msg11236.html so do not
continue building even if a Makefile was generated (an END block or code
after WriteMakefile() could have died for example).
This patch is from trying to fix problems in this thread
http://www.nntp.perl.org/group/perl.perl5.porters/2015/10/msg231903.html