system/perl-5.28: Remove MakeMaker patch

This patch no longer applies and doesn't seem to be needed. Remove it.

system/perl-5.28.1-0.build.sh

@@ -77,19 +77,6 @@ _EOF_
 
 cpan -u			# update everything we already have
 
-# After the update we have a new ExtUtils::MakeMaker.
-# Patch this version to avoid stomping on a perl bug
-# We've got this when building net-snmp (down below).
-# Errors:
-#    "panic: attempt to copy freed scalar"
-#    "Bizarre copy of HASH in list assignment#
-# this is from perl bug:
-#    https://rt.perl.org/Public/Bug/Display.html?id=77706
-# triggered by ExtUtils::MakeMaker.
-# This patch prevents this
-#
-(cd lib/site_perl/$VERSION/ExtUtils; patch -N -p1 < /src/mariux/patches/MakeMaker-0001-MakeMaker.pm-Avoid-triggering-perl-bug.patch)
-
 # These two with -T (without test), because the tests are interactive and access /dev/tty
 # Do these first, because they are required by Bundle::CPAN
 #