for Windows

[zoujiaqing]

#1. not found file

find:
OpenGL/gl.h
replace to:
GL/gl.h
#2. max & min

:\projects\libnui\include\nglSyncEvent.h(29): warning C4003: not enough actual parameters for macro 'max'
#3. undeclared identifier

1>d:\projects\libnui\include\nuiShape.h(76): error C2065: “GLU_TESS_WINDING_ODD”: undeclared identifier
1>d:\projects\libnui\include\nuiShape.h(77): error C2065: “GLU_TESS_WINDING_NONZERO”: undeclared identifier
1>d:\projects\libnui\include\nuiShape.h(78): error C2065: “GLU_TESS_WINDING_POSITIVE”: undeclared identifier
1>d:\projects\libnui\include\nuiShape.h(79): error C2065: “GLU_TESS_WINDING_NEGATIVE”: undeclared identifier
1>d:\projects\libnui\include\nuiShape.h(81): error C2065: “GLU_TESS_WINDING_ABS_GEQ_TWO”: undeclared identifier