docs/relnotes: add GL_ARB_gpu_shader_fp64 support on i965/ivybridge
docs/relnotes: add GL_ARB_gpu_shader_fp64 support on i965/ivybridge

Signed-off-by: Samuel Iglesias Gonsálvez <b753b212f30aed827c3eea2e437609dc37310153@igalia.com>
Acked-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler