perl: Do not build on ARC

Not supported.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

lang/perl/Makefile

@@ -63,7 +63,7 @@ define Package/perl
   CATEGORY:=Languages
   TITLE:=The Perl intepreter
   URL:=http://www.perl.com/
-  DEPENDS:=+USE_GLIBC:libbsd +PERL_THREADS:libpthread
+  DEPENDS:=+USE_GLIBC:libbsd +PERL_THREADS:libpthread @!arc
 endef
 
 define Package/perl/description