Restore value_type member to vectors

glm/core/type_vec1.hpp

@@ -43,6 +43,7 @@ namespace detail
 
 		typedef tvec1<T, P> type;
 		typedef tvec1<bool, P> bool_type;
+		typedef T value_type;
 
 		GLM_FUNC_DECL GLM_CONSTEXPR int length() const;
 

glm/core/type_vec2.hpp

@@ -43,6 +43,7 @@ namespace detail
 
 		typedef tvec2<T, P> type;
 		typedef tvec2<bool, P> bool_type;
+		typedef T value_type;
 
 		GLM_FUNC_DECL GLM_CONSTEXPR int length() const;
 

glm/core/type_vec3.hpp

@@ -43,6 +43,7 @@ namespace detail
 
 		typedef tvec3<T, P> type;
 		typedef tvec3<bool, P> bool_type;
+		typedef T value_type;
 
 		GLM_FUNC_DECL GLM_CONSTEXPR int length() const;
 

glm/core/type_vec4.hpp

@@ -43,6 +43,7 @@ namespace detail
 
 		typedef tvec4<T, P> type;
 		typedef tvec4<bool, P> bool_type;
+		typedef T value_type;
 
 		GLM_FUNC_DECL GLM_CONSTEXPR int length() const;