LibGL: Implement glIsList

Author: https://github.com/gmta
Commit: 506abf2a61
Pull-request: https://github.com/SerenityOS/serenity/pull/11154
Reviewed-by: https://github.com/sunverwerth ✅

Userland/Libraries/LibGL/GL/gl.h

@@ -414,6 +414,7 @@ GLAPI void glDeleteLists(GLuint list, GLsizei range);
 GLAPI void glListBase(GLuint base);
 GLAPI void glEndList(void);
 GLAPI void glNewList(GLuint list, GLenum mode);
+GLAPI GLboolean glIsList(GLuint list);
 GLAPI void glFlush();
 GLAPI void glFinish();
 GLAPI void glBlendFunc(GLenum sfactor, GLenum dfactor);