Merge cmake/findBullet patch for '_debug' postfixed libraries

Merge in the patch from the cmake official repository:
https://cmake.org/gitweb?p=cmake.git;a=commit;h=6f935d7f55af5c96d18d23b72991e87d1e029dda

Without this fix cmake couldn't find bullet's debug libraries,
and VS2010 openmw project file was generated with links to
release libraries instead (which caused errors during build
in debug configuration).

cmake/FindBullet.cmake

@@ -51,13 +51,13 @@ find_path(BULLET_INCLUDE_DIR NAMES btBulletCollisionCommon.h
 # Find the libraries
 
 _FIND_BULLET_LIBRARY(BULLET_DYNAMICS_LIBRARY        BulletDynamics)
-_FIND_BULLET_LIBRARY(BULLET_DYNAMICS_LIBRARY_DEBUG  BulletDynamics_d)
+_FIND_BULLET_LIBRARY(BULLET_DYNAMICS_LIBRARY_DEBUG  BulletDynamics_Debug BulletDynamics_d)
 _FIND_BULLET_LIBRARY(BULLET_COLLISION_LIBRARY       BulletCollision)
-_FIND_BULLET_LIBRARY(BULLET_COLLISION_LIBRARY_DEBUG BulletCollision_d)
-_FIND_BULLET_LIBRARY(BULLET_MATH_LIBRARY            LinearMath BulletMath)
-_FIND_BULLET_LIBRARY(BULLET_MATH_LIBRARY_DEBUG      LinearMath_d BulletMath_d)
+_FIND_BULLET_LIBRARY(BULLET_COLLISION_LIBRARY_DEBUG BulletCollision_Debug BulletCollision_d)
+_FIND_BULLET_LIBRARY(BULLET_MATH_LIBRARY            BulletMath LinearMath)
+_FIND_BULLET_LIBRARY(BULLET_MATH_LIBRARY_DEBUG      BulletMath_Debug BulletMath_d LinearMath_debug LinearMath_d)
 _FIND_BULLET_LIBRARY(BULLET_SOFTBODY_LIBRARY        BulletSoftBody)
-_FIND_BULLET_LIBRARY(BULLET_SOFTBODY_LIBRARY_DEBUG  BulletSoftBody_d)
+_FIND_BULLET_LIBRARY(BULLET_SOFTBODY_LIBRARY_DEBUG  BulletSoftBody_Debug BulletSoftBody_d)
 
 
 # handle the QUIETLY and REQUIRED arguments and set BULLET_FOUND to TRUE if