package/nodejs: add BR2_PACKAGE_HAS_NODEJS

Commit ccf3536fcbfb2f3744ef7ccf1ed1b75d6d1f22ac ("package/nodejs: make
target nodejs package virtual") forgot to introduce the
BR2_PACKAGE_HAS_<foo> boolean option matching the newly introduced
virtual package, causing check package warnings.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 0bae9b29cd2a6008c5945747a45dfe8af54fae35)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/nodejs/Config.in

@@ -87,6 +87,9 @@ config BR2_PACKAGE_NODEJS_MODULES_ADDITIONAL_DEPS
 
 endif
 
+config BR2_PACKAGE_HAS_NODEJS
+	bool
+
 config BR2_PACKAGE_PROVIDES_NODEJS
 	string
 	default "nodejs-src"

package/nodejs/nodejs-src/Config.in

@@ -1,2 +1,3 @@
 config BR2_PACKAGE_NODEJS_SRC
 	bool
+	select BR2_PACKAGE_HAS_NODEJS