GPU: add BUIDTIME to WITH_GPU_SHADER_BUILDER

Adds a better name that describes when it is used.
The GPU_SHADER_BUILDER is a buildtime tool for developers
to pre-validate GLSL (and in the overseen future pre-compile to
SpirV). We don't see that this needs to become a required
step in the future so WITH_GPU_BUILDTIME_SHADER_BUILDER
is more descriptive name.

CMakeLists.txt

@@ -565,13 +565,13 @@ endif()
 option(WITH_OPENGL              "When off limits visibility of the opengl headers to just bf_gpu and gawain (temporary option for development purposes)" ON)
 option(WITH_GLEW_ES             "Switches to experimental copy of GLEW that has support for OpenGL ES. (temporary option for development purposes)" OFF)
 option(WITH_GL_PROFILE_ES20     "Support using OpenGL ES 2.0. (through either EGL or the AGL/WGL/XGL 'es20' profile)"                               OFF)
-option(WITH_GPU_SHADER_BUILDER  "Shader builder is a developer option enabling linting on GLSL during compilation"                                  OFF)
+option(WITH_GPU_BUILDTIME_SHADER_BUILDER  "Shader builder is a developer option enabling linting on GLSL during compilation"                                  OFF)
 
 mark_as_advanced(
   WITH_OPENGL
   WITH_GLEW_ES
   WITH_GL_PROFILE_ES20
-  WITH_GPU_SHADER_BUILDER
+  WITH_GPU_BUILDTIME_SHADER_BUILDER
 )
 
 # Metal
@@ -1340,9 +1340,9 @@ else()
   list(APPEND GL_DEFINITIONS -DWITH_GL_PROFILE_CORE)
 endif()
 
-if (WITH_GPU_SHADER_BUILDER AND WITH_USD)
+if (WITH_GPU_BUILDTIME_SHADER_BUILDER AND WITH_USD)
   message(FATAL_ERROR
-    "Unable to compile WITH_GPU_SHADER_BUILDER and WITH_USD."
+    "Unable to compile WITH_GPU_BUILDTIME_SHADER_BUILDER and WITH_USD."
   )
 endif()
 

source/blender/gpu/CMakeLists.txt

@@ -561,7 +561,7 @@ endif()
 
 
 
-if(WITH_GPU_SHADER_BUILDER)
+if(WITH_GPU_BUILDTIME_SHADER_BUILDER)
   # TODO(@fclem) Fix this mess.
   if(APPLE)
     add_executable(shader_builder