Revert of Turned on SkSL->GLSL compiler

src/sksl/sksl.include

 STRINGIFY(
 
 // defines built-in functions supported by SkiaSL
 
 $genType radians($genType degrees);
 $genType sin($genType angle);
 $genType cos($genType angle);
 $genType tan($genType angle);
 $genType asin($genType x);
 $genType acos($genType x);
@@ skipping 226 matching lines @@
 int textureQueryLevels($gsamplerCubeArray sampler);
 int textureQueryLevels(sampler1DShadow sampler);
 int textureQueryLevels(sampler2DShadow sampler);
 int textureQueryLevels(samplerCubeShadow sampler);
 int textureQueryLevels(sampler1DArrayShadow sampler);
 int textureQueryLevels(sampler2DArrayShadow sampler);
 int textureQueryLevels(samplerCubeArrayShadow sampler);
 $gvec4 texture($gsampler1D sampler, float P);
 $gvec4 texture($gsampler1D sampler, float P, float bias);
 $gvec4 texture($gsampler2D sampler, vec2 P);
-vec4 texture(samplerExternalOES sampler, vec2 P, float bias);
-vec4 texture(samplerExternalOES sampler, vec2 P);
 $gvec4 texture($gsampler2D sampler, vec2 P, float bias);
 $gvec4 texture($gsampler3D sampler, vec3 P);
 $gvec4 texture($gsampler3D sampler, vec3 P, float bias);
 $gvec4 texture($gsamplerCube sampler, vec3 P);
 $gvec4 texture($gsamplerCube sampler, vec3 P, float bias);
 float texture(sampler1DShadow sampler, vec3 P);
 float texture(sampler1DShadow sampler, vec3 P, float bias);
 float texture(sampler2DShadow sampler, vec3 P);
 float texture(sampler2DShadow sampler, vec3 P, float bias);
 float texture(samplerCubeShadow sampler, vec4 P);
@@ skipping 200 matching lines @@
 vec4 texture1D(sampler1D sampler, float coord);
 vec4 texture1D(sampler1D sampler, float coord, float bias);
 vec4 texture1DProj(sampler1D sampler, vec2 coord);
 vec4 texture1DProj(sampler1D sampler, vec2 coord, float bias);
 vec4 texture1DProj(sampler1D sampler, vec4 coord);
 vec4 texture1DProj(sampler1D sampler, vec4 coord, float bias);
 vec4 texture1DLod(sampler1D sampler, float coord, float lod);
 vec4 texture1DProjLod(sampler1D sampler, vec2 coord, float lod);
 vec4 texture1DProjLod(sampler1D sampler, vec4 coord, float lod);
 vec4 texture2D(sampler2D sampler, vec2 coord);
-vec4 texture2D(samplerExternalOES sampler, vec2 coord);
 vec4 texture2D(sampler2D sampler, vec2 coord, float bias);
 vec4 texture2DProj(sampler2D sampler, vec3 coord);
 vec4 texture2DProj(sampler2D sampler, vec3 coord, float bias);
 vec4 texture2DProj(sampler2D sampler, vec4 coord);
 vec4 texture2DProj(sampler2D sampler, vec4 coord, float bias);
 vec4 texture2DLod(sampler2D sampler, vec2 coord, float lod);
 vec4 texture2DProjLod(sampler2D sampler, vec3 coord, float lod);
 vec4 texture2DProjLod(sampler2D sampler, vec4 coord, float lod);
 vec4 texture3D(sampler3D sampler, vec3 coord);
 vec4 texture3D(sampler3D sampler, vec3 coord, float bias);
@@ skipping 58 matching lines @@
 void barrier();
 void memoryBarrier();
 void memoryBarrierAtomicCounter();
 void memoryBarrierBuffer();
 void memoryBarrierShared();
 void memoryBarrierImage();
 void groupMemoryBarrier();
 
 )