Heap buffer overflow when using vlc_gl_HasExtension on OSX

See !1315 (closed)

==15037==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c00040e0c8 at pc 0x0001003436ae bp 0x70000acc6af0 sp 0x70000acc6ae8
READ of size 8 at 0x60c00040e0c8 thread T20
    #0 0x1003436ad in vlc_gl_HasExtension opengl.c:206
    #1 0x10bdc1ee3 in vlc_gl_api_Init gl_api.c:180
    #2 0x10bdaa077 in vout_display_opengl_New vout_helper.c:110
    #3 0x10bd94882 in Open macosx.m:236

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