Revert of Turned on SkSL->GLSL compiler

src/sksl/sksl_frag.include

 STRINGIFY(
 
 // defines built-in interfaces supported by SkiaSL fragment shaders
 
 layout(builtin=15) in vec4 gl_FragCoord;
 
-// 9999 is a temporary value that causes us to ignore these declarations beyond
-// adding them to the symbol table. This works fine in GLSL (where they do not
-// require any further handling) but will fail in SPIR-V. We'll have a better
-// solution for this soon.
-layout(builtin=9999) vec4 gl_LastFragData[1];
-layout(builtin=9999) vec4 gl_LastFragColor;
-layout(builtin=9999) vec4 gl_LastFragColorARM;
-layout(builtin=9999) int gl_SampleMaskIn[];
-layout(builtin=9999) out int gl_SampleMask[];
+)
 
-layout(location=0,index=0,builtin=10001) out vec4 sk_FragColor;
-
-)