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st/mesa: support GL_ARB_get_program_binary even disk cache is disabled

Kevin Wen requested to merge fix_arb_get_program_binary into main

Current implementation of GL_ARB_get_program_binary is depended on disk cache support of specific gallium driver.

GL_ARB_get_program_binary is not supported if get_disk_shader_cache is not implemented in the specific gallium driver. GL_ARB_get_program_binary is either not supported if ENABLE_SHADER_CACHE is disabled.

This patch will break the relationship of the two things, then we can support GL_ARB_get_program_binary even get_disk_shader_cache is NULL or ENABLED_Shader_Cache is disabled.

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