Fixed typo

glm/ext/vector_double1.hpp

@@ -16,7 +16,7 @@
 #include "../detail/type_vec1.hpp"
 
 #if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
-#	pragma message("GLM: GLM_EXT_vector_dvec1 extension included")
+#	pragma message("GLM: GLM_EXT_vector_double1 extension included")
 #endif
 
 namespace glm