package/libnspr: allow building for Arc Architecture

Arc architecture is now supported by NSPR so let's allow to build for
it.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libnspr/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_LIBNSPR_ARCH_SUPPORT
 	def_bool y
-	depends on !BR2_arc && !BR2_xtensa
+	depends on !BR2_xtensa
 
 if BR2_PACKAGE_LIBNSPR_ARCH_SUPPORT