intltool: Allow nativesdk variant to build

This tool has been missing from the SDKs, the recipe specific sysroot
work highlighted the issues.

(From OE-Core rev: e4346299da911dd7c43c2e221b941e5cda502d1e)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/intltool/intltool_0.51.0.bb

@@ -22,6 +22,7 @@ inherit autotools pkgconfig perlnative
 
 export PERL = "${bindir}/env perl"
 PERL_class-native = "/usr/bin/env nativeperl"
+PERL_class-nativesdk = "/usr/bin/env perl"
 
 # gettext is assumed to exist on the host
 RDEPENDS_${PN}_class-native = "libxml-parser-perl-native"
@@ -33,4 +34,4 @@ FILES_${PN} += "${datadir}/aclocal"
 
 INSANE_SKIP_${PN} += "dev-deps"
 
-BBCLASSEXTEND = "native"
+BBCLASSEXTEND = "native nativesdk"