Minor: casting to pointers of different size

[dumblob]

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source/dao_opengl.c: In function ‘DaoxBuffer_MapVertices’:
source/dao_opengl.c:1207:2: warning: return makes pointer from integer without a cast
  return glMapBufferRange( GL_ARRAY_BUFFER, self->vertexOffset*self->vertexSize, dataSize, GL_MAP_WRITE_BIT|GL_MAP_UNSYNCHRONIZED_BIT|GL_MAP_INVALIDATE_BUFFER_BIT );
  ^
source/dao_opengl.c: In function ‘DaoxBuffer_MapTriangles’:
source/dao_opengl.c:1230:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  return (DaoGLTriangle*) glMapBufferRange( GL_ELEMENT_ARRAY_BUFFER, self->triangleOffset*self->triangleSize, dataSize, GL_MAP_WRITE_BIT|GL_MAP_UNSYNCHRONIZED_BIT|GL_MAP_INVALIDATE_BUFFER_BIT );
         ^
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make[3]: Leaving directory '/home/test/dao/modules/DaoGraphics'
cd DaoOpenGL && make -f Makefile
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