Fix array out of bounds bug in processing if-else-endif macros.
If we are not inside an if macro, we cannot simply decrease elsetracker. Fixes https://github.com/KhronosGroup/glslang/issues/29.
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If we are not inside an if macro, we cannot simply decrease elsetracker. Fixes https://github.com/KhronosGroup/glslang/issues/29.