Add pthread dll for MinGW64 during installation. Now people who download from buildbot will be able to run the build even without MinGW-w64 installed.

SConstruct

@@ -805,6 +805,7 @@ if env['OURPLATFORM'] == 'win64-mingw':
         dllsources.append('${LCGDIR}/sdl/lib/SDL.dll')
 	
     dllsources.append('${LCGDIR}/thumbhandler/lib/BlendThumb64.dll')
+    dllsources.append('${LCGDIR}/binaries/pthreadGC2-w64.dll')
     dllsources.append('#source/icons/blender.exe.manifest')
 
     windlls = env.Install(dir=env['BF_INSTALLDIR'], source = dllsources)

source/creator/CMakeLists.txt

@@ -566,6 +566,11 @@ elseif(WIN32)
 				FILES ${LIBDIR}/pthreads/lib/pthreadGC2.dll
 				DESTINATION ${TARGETDIR}
 			)
+		elseif(WITH_MINGW64)
+			install(
+				FILES ${LIBDIR}/binaries/pthreadGC2-w64.dll
+				DESTINATION ${TARGETDIR}
+			)
 		endif()
 	endif()