Robert Müller 4f90432a49 Emscripten: fix incorrect error check for WebGL context creation
According to the documentation and testing the `emscripten_webgl_create_context` function returns `0` on error as oppposed to a negative number. This was causing the error message to be empty when the later `emscripten_webgl_make_context_current` call fails given the invalid context.

See https://emscripten.org/docs/api_reference/html5.h.html#c.emscripten_webgl_create_context

(cherry picked from commit 7e1d4f843c)
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Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.

You can find the latest release and additional information at: https://www.libsdl.org/

Installation instructions and a quick introduction is available in INSTALL.md

This library is distributed under the terms of the zlib license, available in LICENSE.txt.

Enjoy!

Sam Lantinga (slouken@libsdl.org)

Description
Simple Directmedia Layer
Readme 175 MiB
Languages
C 86.4%
C++ 5.9%
Objective-C 3.4%
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