Added some missing win32 GL function support needed for GL3

modules/juce_opengl/native/juce_OpenGLExtensions.h

@@ -73,6 +73,9 @@
     USE_FUNCTION (glVertexAttribPointer,    void, (GLuint p1, GLint p2, GLenum p3, GLboolean p4, GLsizei p5, const GLvoid* p6), (p1, p2, p3, p4, p5, p6))\
     USE_FUNCTION (glEnableVertexAttribArray,  void, (GLuint p1), (p1))\
     USE_FUNCTION (glDisableVertexAttribArray, void, (GLuint p1), (p1))\
+    USE_FUNCTION (glGenVertexArrays,        void, (GLsizei p1, GLuint* p2), (p1, p2))\
+    USE_FUNCTION (glDeleteVertexArrays,     void, (GLsizei p1, const GLuint* p2), (p1, p2))\
+    USE_FUNCTION (glBindVertexArray,        void, (GLuint p1), (p1))\
     USE_FUNCTION (glUniform1f,              void, (GLint p1, GLfloat p2), (p1, p2))\
     USE_FUNCTION (glUniform1i,              void, (GLint p1, GLint p2), (p1, p2))\
     USE_FUNCTION (glUniform2f,              void, (GLint p1, GLfloat p2, GLfloat p3), (p1, p2, p3))\

modules/juce_opengl/opengl/juce_OpenGLContext.cpp

@@ -279,7 +279,7 @@ public:
     {
        #if JUCE_OPENGL3
         if (vertexArrayObject != 0)
-            glBindVertexArray (vertexArrayObject);
+            context.extensions.glBindVertexArray (vertexArrayObject);
        #endif
     }
 
@@ -457,7 +457,7 @@ public:
        #if JUCE_OPENGL3
         if (OpenGLShaderProgram::getLanguageVersion() > 1.2)
         {
-            glGenVertexArrays (1, &vertexArrayObject);
+            context.extensions.glGenVertexArrays (1, &vertexArrayObject);
             bindVertexArray();
         }
        #endif
@@ -484,7 +484,7 @@ public:
 
        #if JUCE_OPENGL3
         if (vertexArrayObject != 0)
-            glDeleteVertexArrays (1, &vertexArrayObject);
+            context.extensions.glDeleteVertexArrays (1, &vertexArrayObject);
        #endif
 
         associatedObjectNames.clear();