[Piglit] [PATCH RESEND 0/3] glslparsertest: ES fixes

[Paul Berry]

These patches seem to have fallen through the cracks last time I sent
them (2/14).  I'd appreciate some review.  Without these patches,
glslparsertest_gles2 doesn't work at all, since it parses the GLSL
version string incorrectly, refers to uninitialized data, and checks
for incorrect extensions.

[PATCH RESEND 1/3] glslparsertest: Fix parsing of GL_SHADING_LANGUAGE_VERSION in GLES.
[PATCH RESEND 2/3] glslparsertest: Don't require ES compatibility extensions when testing GLES.
[PATCH RESEND 3/3] glslparsertest: Avoid uninitialized vars in parse_glsl_version_number.