Fixed typo in cmake build rule for Linux.

Tested:
Verified it's possible to build generated headers on Linux for Android.

Change-Id: I82249a252cb851b978a177f4a4b92b527cc2bfd9

android/jni/include.mk

@@ -113,7 +113,7 @@ endif
 ifeq (Linux,$(PROJECT_OS))
 define build_flatc_recipe
 	+cd $(FLATBUFFERS_CMAKELISTS_DIR) && \
-      $(CMAKE) && \
+      $(CMAKE) . && \
       $(MAKE) flatc
 endef
 endif