Call glValidateProgram() before querying GL_VALIDATE_STATUS

Call glValidateProgram() before querying GL_VALIDATE_STATUS

The DSA program_pipelines_functional test queries this param
without calling glValidateProgram() first, which is not
correct:

From section 7.13. SHADER, PROGRAM, AND PROGRAM PIPELINE QUERIES:

"If pname is VALIDATE_STATUS, TRUE is returned if the last
 call to ValidateProgram (see section 11.1.3.11) with
 program was successful, and FALSE is returned otherwise."

Components: OpenGL
VK-GL-CTS issue: 498

Affects:
KHR-GL45.direct_state_access.program_pipelines_functional

Change-Id: I4de325f0779c3330523b1fac1845d287b790ee3a