GL: some GLES extensions weren't reported as used during startup.

Huh.

src/Magnum/GL/Implementation/ShaderProgramState.cpp

@@ -81,7 +81,8 @@ ShaderProgramState::ShaderProgramState(Context& context, Containers::StaticArray
     }
 
     if(context.isExtensionSupported<Extensions::KHR::parallel_shader_compile>()) {
-        extensions[Extensions::KHR::parallel_shader_compile::Index] = Extensions::KHR::parallel_shader_compile::string();
+        extensions[Extensions::KHR::parallel_shader_compile::Index] =
+                   Extensions::KHR::parallel_shader_compile::string();
         completionStatusImplementation = glGetProgramiv;
     } else {
         completionStatusImplementation = &AbstractShaderProgram::completionStatusImplementationFallback;

src/Magnum/GL/Implementation/ShaderState.cpp

@@ -71,7 +71,8 @@ ShaderState::ShaderState(Context& context, Containers::StaticArrayView<Implement
     }
 
      if(context.isExtensionSupported<GL::Extensions::KHR::parallel_shader_compile>()) {
-        extensions[Extensions::KHR::parallel_shader_compile::Index] = Extensions::KHR::parallel_shader_compile::string();
+        extensions[Extensions::KHR::parallel_shader_compile::Index] =
+                   Extensions::KHR::parallel_shader_compile::string();
         completionStatusImplementation = glGetShaderiv;
     } else {
         completionStatusImplementation = &Shader::completionStatusImplementationFallback;

src/Magnum/GL/Implementation/TextureState.cpp

@@ -235,6 +235,8 @@ TextureState::TextureState(Context& context,
         parameterIuivImplementation = &AbstractTexture::parameterIImplementationDefault;
         parameterIivImplementation = &AbstractTexture::parameterIImplementationDefault;
     } else if(context.isExtensionSupported<Extensions::EXT::texture_border_clamp>()) {
+        extensions[Extensions::EXT::texture_border_clamp::Index] =
+                   Extensions::EXT::texture_border_clamp::string();
         parameterIuivImplementation = &AbstractTexture::parameterIImplementationEXT;
         parameterIivImplementation = &AbstractTexture::parameterIImplementationEXT;
     } else {
@@ -247,6 +249,8 @@ TextureState::TextureState(Context& context,
         setBufferImplementation = &BufferTexture::setBufferImplementationDefault;
         setBufferRangeImplementation = &BufferTexture::setBufferRangeImplementationDefault;
     } else if(context.isExtensionSupported<Extensions::EXT::texture_buffer>()) {
+        extensions[Extensions::EXT::texture_buffer::Index] =
+                   Extensions::EXT::texture_buffer::string();
         setBufferImplementation = &BufferTexture::setBufferImplementationEXT;
         setBufferRangeImplementation = &BufferTexture::setBufferRangeImplementationEXT;
     } else {