Using dlopen/dlsym works, but eglGetProcAddress is a little easier and
more consistent with how GL extension functions (rather than these
non-extension functions) are loaded.
Change-Id: I082c193f08f7d5456389ab783a06cd38a9632d53
* Headers were copied from frameworks/native/opengl/include/GLES3/.
* Symbol lists were generated with ndk/build/tools/gen-system-symbols.sh.
* Symbols are identical between architectures
Change-Id: I011094ea3b479cf166ffb6bef3778cde683fc502