Fixed compilation error in 32-bit portable mode, because the multi-texture stub functions aren't actually function pointers as was previously declared.

engine/Quake/glquake.h

@@ -160,9 +160,14 @@ extern int		gl_stencilbits;
 // Multitexture
 extern	qboolean	mtexenabled;
 extern	qboolean	gl_mtexable;
+#if USE_OPENGL
 extern PFNGLMULTITEXCOORD2FARBPROC  GL_MTexCoord2fFunc;
 extern PFNGLACTIVETEXTUREARBPROC    GL_SelectTextureFunc;
 extern PFNGLCLIENTACTIVETEXTUREARBPROC	GL_ClientActiveTextureFunc;
+#else
+GLAPI void GLAPIENTRY GL_MTexCoord2fFunc(GLenum target, GLfloat s, GLfloat t);
+GLAPI void GLAPIENTRY GL_SelectTextureFunc(GLenum target);
+#endif
 extern GLint		gl_max_texture_units; //ericw
 
 //johnfitz -- anisotropic filtering