Add openSSL & crypt32 libs

RE: 69e0e280b97d427dda6bd74942b916b70cf3e79f
Portable Warzone fixes for windows.
Fix windows paths.

Windows portable icon by forum member Duda.
Portable header & welcome images from forum member Aubergine.
Image fixes supplied by Berg.

Note: In configure stage (Windows only!), you can specify --enable-portable [default no] to
      create a portable installer. (That is, everything is self-contained in the directory
      you install Warzone 2100 to.  It will *not* use any other directory on the system.)
      If you pass --with-videos [default no], then it will add the videos with the portable
      installer and looks for the video file in \opt\sequences.wz

FIXME: Need: RUSSIAN, GERMAN, DUTCH, tranlations fixes for the warzone2100.nsi file.
Remove lines that caused asserts, and fix what the line to display what it displayed before.
Add donation link
Update GLM to 0.9.4.4

Changelog:
    Fixed slerp when costheta is close to 1 #65
    Fixed mat4x2 value_type constructor #70
    Fixed glm.natvis for Visual C++ 12 #82
    Added assert in inversesqrt to detect division by zero #61
    Fixed missing swizzle operators #86
    Fixed GLM natvis for VC11 #82
    Fixed GLM_GTX_multiple with negative values #79
    Fixed glm::perspective when zNear is zero #71
Fix build issues from 5bdc9c29e90f997ca172abddccf1146083f91a57
Disable 'View Intro' when videos are not installed.