Git.pm: Don't #define around die

Back in the old days, we called Git's die() from the .xs code, but we had to
hijack Perl's die() for that. Now we don't call Git's die() so no need to do
the hijacking and it silences a compiler warning.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

perl/Git.xs

@@ -8,15 +8,11 @@
 #include "../cache.h"
 #include "../exec_cmd.h"
 
-#define die perlyshadow_die__
-
 /* XS and Perl interface */
 #include "EXTERN.h"
 #include "perl.h"
 #include "XSUB.h"
 
-#undef die
-
 
 static char *
 report_xs(const char *prefix, const char *err, va_list params)