game entry file names changed to canonical version

games/pthreads-win32.md

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+# Pthreads-win32
+
+_Implements a large subset of the POSIX standard threads related API._
+
+- Home: https://sourceware.org/pthreads-win32/
+- Media: https://en.wikipedia.org/wiki/POSIX_Threads#POSIX_Threads_for_Windows
+- State: mature
+- Download: (see home)
+- Keywords: library
+- Code repository: https://github.com/GerHobbelt/pthread-win32.git, (cvs, see home) 
+- Code language: C
+- Code license: LGPL-2.1
+
+## Building
+
+Manually created project files for MSVC.
+