patch 8.0.1110: FORTIFY_SOURCE from Perl causes problems

Problem:    FORTIFY_SOURCE from Perl causes problems. (Scott Baker)
Solution:   Filter out the flag. (Christian Brabandt, closes #2068)
diff --git a/src/auto/configure b/src/auto/configure
index 7e46662..51dbd48 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -5717,9 +5717,10 @@
 	fi
       done
 
-                  perlcppflags=`$vi_cv_path_perl -Mlib=$srcdir -MExtUtils::Embed \
-	      -e 'ccflags;perl_inc;print"\n"' | sed -e 's/-fno[^ ]*//' \
-			-e 's/-fdebug-prefix-map[^ ]*//g'`
+                        perlcppflags=`$vi_cv_path_perl -Mlib=$srcdir -MExtUtils::Embed \
+		-e 'ccflags;perl_inc;print"\n"' | sed -e 's/-fno[^ ]*//' \
+		-e 's/-fdebug-prefix-map[^ ]*//g' \
+		-e 's/\(-Wp,\)\?-D_FORTIFY_SOURCE=.//g`
             perllibs=`cd $srcdir; $vi_cv_path_perl -MExtUtils::Embed -e 'ldopts' | \
 		sed -e '/Warning/d' -e '/Note (probably harmless)/d' \
 			-e 's/-bE:perl.exp//' -e 's/-lc //'`