CMakeLists.txt: Find AT-specific jni.h

Updated the java CMakeLists file to set the JAVA_INCLUDE_PATH for
Android Things.  The JAVA SWIG wrapper will require the jni.h from the
Android NDK.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/java/CMakeLists.txt

@@ -1,4 +1,11 @@
 FIND_PACKAGE (JNI REQUIRED)
+
+if (PERIPHERALMAN)
+  # Override the JNI include directory for Android Things since these
+  # will require an Android-friendly jni.h
+  set(JAVA_INCLUDE_PATH "${ANDROID_SYSROOT}/usr/include")
+endif()
+
 include_directories (
   ${JAVA_INCLUDE_PATH}
   ${JAVA_INCLUDE_PATH2}