FindBullet: Search in per-config dirs on Windows (#13738)

Bullet for windows installs in these per-config paths.

Modules/FindBullet.cmake

@@ -33,6 +33,8 @@ macro(_FIND_BULLET_LIBRARY _var)
         ${ARGN}
      HINTS
         ${BULLET_ROOT}
+        ${BULLET_ROOT}/lib/Release
+        ${BULLET_ROOT}/lib/Debug
         ${BULLET_ROOT}/out/release8/libs
         ${BULLET_ROOT}/out/debug8/libs
      PATH_SUFFIXES lib