Create AndroidNdkGdb.cmake
Update AndroidNdkGdb.cmake

add licensing header
* wrap function bodies in if(ANDROID)
* rename GDB_SOLIB_PATH to NDK_GDB_SOLIB_PATH
* ensure jni/ folder exists
* do not overwrite existing Android *.mk files
Merge pull request #19 from paroj/master

Create AndroidNdkGdb.cmake