Fixed tonnes of -Wmissing-prototypes warnings

Just added 'static' in front of many private functions.

Change-Id: I892a46d684e00a44e7f84a7343e2cf5690f07eed
Merge topic 'Wmissing-prototypes' into master

d9313162 Fixed tonnes of -Wmissing-prototypes warnings
Fix issues in vtkOpenGLPainterDeviceAdapter::SendMaterialProperties()

This fixes a few issues in the SendMaterialProperties() method in
the vtkOpenGLPainterDeviceAdapter class.

1. The enums for the glMaterialfv() calls were wrong when the
   data type was double.
2. Some use-cases don't need to set the specular power. Now there
   is a check for null specular_power pointer and it will only be
   set if a valid pointer is passed.

Change-Id: Ifa3e9814f87ecaec30ad3d41a9ba706469be23ca
Merge topic 'fix-send-material-properties-issues' into master

69d4df39 Fix issues in vtkOpenGLPainterDeviceAdapter::SendMaterialProperties()
Removed Win 9x support

Change-Id: Ib33a7927f29a6883c84ed4c8791d9e679d85a4d0
Merge topic 'readme-windows' into master

a760d432 Removed Win 9x support