apkbuild-cpan: invoke default_prepare in prepare() function

apkbuild-cpan.in

@@ -41,6 +41,8 @@ source="[% source %]"
 builddir="$srcdir/$_pkgreal-$pkgver"
 
 prepare() {
+	default_prepare || return 1
+
 	cd "$builddir"
 	if [ -e Build.PL ]; then
 		perl Build.PL installdirs=vendor || return 1
@@ -166,6 +168,8 @@ sub update_functions {
 	if (-e "$metaprefix/Build.PL" ) {
 		$prepare_func = <<'EOF';
 prepare() {
+	default_prepare || return 1
+
 	cd "$builddir"
 	export CFLAGS=$(perl -MConfig -E 'say $Config{ccflags}')
 	perl Build.PL installdirs=vendor || return 1
@@ -188,6 +192,8 @@ EOF
 	} else {
 		$prepare_func = <<'EOF';
 prepare() {
+	default_prepare || return 1
+
 	cd "$builddir"
 	export CFLAGS=$(perl -MConfig -E 'say $Config{ccflags}')
 	PERL_MM_USE_DEFAULT=1 perl Makefile.PL INSTALLDIRS=vendor