Android thread panic in gleam caused by "no more slots for eglGetProcAddress"

[mbrubeck]

After various recent upgrades, Android was panicking on startup due to GL function pointers failing to load (#4824). We addressed this in #4830 by calling get_proc_address on Android like we do on desktop platforms, and this appears to work on some Android devices, but it fails on my Android 4.1 tablet with tegra graphics:

...
E/libEGL  ( 2001): no more slots for eglGetProcAddress("glWindowPos3sv")
E/libEGL  ( 2001): no more slots for eglGetProcAddress("glWindowPos3svARB")
E/libEGL  ( 2001): no more slots for eglGetProcAddress("glWindowPos3svMESA")
D/RustAndroidGlueStdouterr( 2001): thread '<unnamed>' panicked at '`ShaderSource` was not loaded', /home/mbrubeck/src/android-servo/components/servo/target/arm-linux-androideabi/build/gleam-d3837506b4549386/out/gl_bindings.rs:25330

Apparently this Android has a small fixed number of slots for eglGetProcAddress, so we can't use it to dynamically load every GL function. We need to investigate why static binding isn't working.

[mbrubeck]

Once we land servo/rust-layers#148 and servo/gleam#12 we can revert #4830, and this issue will be fixed.

[mbrubeck]

Fixed during the latest rust upgrade.