Fix GLES2 shader storage support #1774
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This is to fix a crash reported in #1765 (glProgramParameteri does not exist in GLES2)
I also changed GLES2 to use glProgramBinaryOES and glGetProgramBinaryOES.
Finally, we used to just check for GL_OES_get_program_binary or GL_ARB_get_program_binary, but I added a check for GLES 3.0+ or GL4.1+, since program binaries are not extensions in those versions.