rapidjson: Allow empty package

Causes the empty base package to be created so that RapidJSON can be
sanely included in an SDK via IMAGE_INSTALL, RDEPENDS, and the like.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/rapidjson/rapidjson_git.bb

@@ -18,6 +18,6 @@ EXTRA_OECMAKE += "-DRAPIDJSON_BUILD_DOC=OFF -DRAPIDJSON_BUILD_TESTS=OFF -DRAPIDJ
 
 # RapidJSON is a header-only C++ library, so the main package will be empty.
 
-RDEPENDS_${PN}-dev = ""
+ALLOW_EMPTY_${PN} = "1"
 
 BBCLASSEXTEND = "native nativesdk"