rapidjson: explicitly disable unit tests

Normally the unit tests don't get compiled as gtest sources are not
available. However it's possible that gtest sources may be found on
the host, so make it explicit that unit tests should not be enabled.

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/rapidjson/rapidjson_1.0.2.bb

@@ -15,7 +15,7 @@ S = "${WORKDIR}/git"
 
 inherit cmake
 
-EXTRA_OECMAKE += "-DRAPIDJSON_BUILD_DOC=OFF"
+EXTRA_OECMAKE += "-DRAPIDJSON_BUILD_DOC=OFF -DRAPIDJSON_BUILD_TESTS=OFF"
 
 # RapidJSON is a header-only C++ library, so the main package will be empty.