[Feat] (...): Add GLES Backend.

include/glm/ext/matrix_float2x4.hpp

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+/// @ref core
+/// @file glm/ext/matrix_float2x4.hpp
+
+#pragma once
+#include "../detail/type_mat2x4.hpp"
+
+namespace glm
+{
+	/// @addtogroup core_matrix
+	/// @{
+
+	/// 2 columns of 4 components matrix of single-precision floating-point numbers.
+	///
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 4.1.6 Matrices</a>
+	typedef mat<2, 4, float, defaultp>		mat2x4;
+
+	/// @}
+}//namespace glm