kwin: Don't require GL_ARB_shading_language_100

This version of GLSL is not supported in a core context.

libkwineffects/kwinglplatform.cpp

@@ -570,10 +570,9 @@ void GLPlatform::detect(OpenGLPlatformInterface platformInterface)
         m_supportsGLSL = true;
         m_textureNPOT = true;
 #else
-        m_supportsGLSL = m_extensions.contains("GL_ARB_shading_language_100") &&
-                        m_extensions.contains("GL_ARB_shader_objects") &&
-                        m_extensions.contains("GL_ARB_fragment_shader") &&
-                        m_extensions.contains("GL_ARB_vertex_shader");
+        m_supportsGLSL = m_extensions.contains("GL_ARB_shader_objects") &&
+                         m_extensions.contains("GL_ARB_fragment_shader") &&
+                         m_extensions.contains("GL_ARB_vertex_shader");
 
         m_textureNPOT = m_extensions.contains("GL_ARB_texture_non_power_of_two");
 #endif
@@ -582,10 +581,9 @@ void GLPlatform::detect(OpenGLPlatformInterface platformInterface)
         GLXContext ctx = glXGetCurrentContext();
         m_directRendering = glXIsDirect(display(), ctx);
 
-        m_supportsGLSL = m_extensions.contains("GL_ARB_shading_language_100") &&
-                        m_extensions.contains("GL_ARB_shader_objects") &&
-                        m_extensions.contains("GL_ARB_fragment_shader") &&
-                        m_extensions.contains("GL_ARB_vertex_shader");
+        m_supportsGLSL = m_extensions.contains("GL_ARB_shader_objects") &&
+                         m_extensions.contains("GL_ARB_fragment_shader") &&
+                         m_extensions.contains("GL_ARB_vertex_shader");
 
         m_textureNPOT = m_extensions.contains("GL_ARB_texture_non_power_of_two");
 #endif