Maybe fix #5551

If we were doing this properly, we'd migrate to
https://cmake.org/cmake/help/latest/module/InstallRequiredSystemLibraries.html
but this should hopefully remove a blocker for 0.47

CMakeLists.txt

@@ -830,13 +830,13 @@ elseif(NOT APPLE)
         SET(VCREDIST32 "${OpenMW_BINARY_DIR}/vcredist_x86.exe")
         if(EXISTS ${VCREDIST32})
             INSTALL(FILES ${VCREDIST32} DESTINATION "redist")
-            SET(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "ExecWait '\\\"$INSTDIR\\\\redist\\\\vcredist_x86.exe\\\" /q'" )
+            SET(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "ExecWait '\\\"$INSTDIR\\\\redist\\\\vcredist_x86.exe\\\" /q /norestart'" )
         endif(EXISTS ${VCREDIST32})
 
         SET(VCREDIST64 "${OpenMW_BINARY_DIR}/vcredist_x64.exe")
         if(EXISTS ${VCREDIST64})
             INSTALL(FILES ${VCREDIST64} DESTINATION "redist")
-            SET(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "ExecWait '\\\"$INSTDIR\\\\redist\\\\vcredist_x64.exe\\\" /q'" )
+            SET(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "ExecWait '\\\"$INSTDIR\\\\redist\\\\vcredist_x64.exe\\\" /q /norestart'" )
         endif(EXISTS ${VCREDIST64})
 
         SET(OALREDIST "${OpenMW_BINARY_DIR}/oalinst.exe")