[Piglit] glsl_parser_test: Changes to config section

[Chad Versace]

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If you write glsl parser tests that explicitly rely on extensions, take
notice. I have made two changes to the config section of glsl parser test.

1. Option 'extension' has been renamed to 'require_extensions'. All
existing tests have been modified to reflect this change.

2. A new option has been introduced: override_extensions. This option is
useful for testing extensions that have been implemented in the
compiler, but are not yet enabled in the driver.

To manually enable an extension, prefix it with '+'. For example:
- ------------------
// [config]
// expect_result: pass
// glsl_version: 1.30
// require_extensions: GL_AMD_conservative_depth
// override_extensions: +GL_AMD_conservative_depth
// [end config]

#version 130
#extension GL_AMD_conservative_depth: require

layout (depth_any) out float gl_FragDepth;

float f() {
    return 0.0;
}
- ------------------

Option 'override_extensions' is also capable of manually disabling
extensions, by prefixing the extension name with '-'.

- -- 
Chad Versace
chad at chad-versace.us
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