perl: fix lseeksize on 32-bit glibc.

This resulted in ABI incompatibility "loadable library and perl binaries
are mismatched (got handshake key 0x7f00080, needed 0x7e00080)".

Fixes #5667.

srcpkgs/perl/template

@@ -1,7 +1,7 @@
 # Template build file for 'perl'.
 pkgname=perl
 version=5.24.1
-revision=2
+revision=3
 _perl_cross_version=1.1.3
 build_style=gnu-configure
 hostmakedepends="less"
@@ -166,6 +166,13 @@ do_configure() {
 		_args+=" --target=$XBPS_CROSS_TRIPLET"
 	fi
 
+	# perl-cross autodetection fails. Need perl -V:lseeksize = 8.
+	# (default on musl.)
+	case "$XBPS_TARGET_MACHINE" in
+	i686|armv6l|armv7l)
+		CFLAGS+=" -D_FILE_OFFSET_BITS=64 -DLARGE_FILE_SUPPORT "
+	esac
+
 	export LD="$CC"
 	./configure --prefix=/usr $_args \
 		-Dcccdlflags="-fPIC" \