Added OES_texture_npot ES extension to the list.

Nothing new added, but the user can rely on presence of this
extension as it removes some restrictions from the speccs.

doc/opengl-support.dox

@@ -323,6 +323,7 @@ supported. ESSL 3.10 is supported.
 @es_extension{OES,texture_float_linear}     | done
 @es_extension2{OES,texture_half_float,OES_texture_float} | done
 @es_extension{OES,texture_float}            | done
+@es_extension{OES,texture_npot}             | done (nothing to do)
 @es_extension{OES,vertex_half_float}        | done
 @es_extension{OES,packed_depth_stencil}     | done
 @es_extension{OES,depth_texture}            | done

src/Magnum/Context.cpp

@@ -284,6 +284,7 @@ const std::vector<Extension>& Extension::extensions(Version version) {
         _extension(GL,OES,texture_float_linear),
         _extension(GL,OES,texture_half_float),
         _extension(GL,OES,texture_float),
+        _extension(GL,OES,texture_npot),
         _extension(GL,OES,vertex_half_float),
         _extension(GL,OES,packed_depth_stencil),
         _extension(GL,OES,depth_texture),

src/Magnum/Extensions.h

@@ -337,6 +337,7 @@ namespace GL {
         _extension(GL,OES,texture_float_linear,     GLES200, GLES300) // #35
         _extension(GL,OES,texture_half_float,       GLES200, GLES300) // #36
         _extension(GL,OES,texture_float,            GLES200, GLES300) // #36
+        _extension(GL,OES,texture_npot,             GLES200, GLES300) // #37
         _extension(GL,OES,vertex_half_float,        GLES200, GLES300) // #38
         _extension(GL,OES,packed_depth_stencil,     GLES200, GLES300) // #43
         _extension(GL,OES,depth_texture,            GLES200, GLES300) // #44