perl: restore compat with 3.5 runtime

by avoid using setproctitle(), similar to 9a7bcb4371912d81558e8

perl/PKGBUILD

@@ -3,7 +3,7 @@
 pkgbase=perl
 pkgname=('perl' 'perl-doc' 'perl-devel')
 pkgver=5.38.4
-pkgrel=1
+pkgrel=2
 pkgdesc="A highly capable, feature-rich programming language"
 arch=(i686 x86_64)
 license=('GPL')
@@ -84,7 +84,8 @@ build() {
     -Dmyarchname=${ARCH}-cygwin \
     -Dlibperl=msys-perl"$(echo "${pkgver%.[0-9]*}" | tr . _)".dll \
     -Dcc=gcc -Dld=g++ \
-    -Accflags="$CFLAGS -fwrapv"
+    -Accflags="$CFLAGS -fwrapv" \
+    -Ud_setproctitle
 
   LC_ALL=C make