CMake: Create a new config.h only if it differs from the old config.h. This helps avoid the situation: 1) you change some CMakeLists.txt somewhere 2) you run "make" which runs cmake automagically 3) cmake rewrites config.h and the following make will pick it up    as a change of dependency for a lot of files which #include "config.h"
CMake: Create a new config.h only if it differs from the old config.h.
This helps avoid the situation:
1) you change some CMakeLists.txt somewhere
2) you run "make" which runs cmake automagically
3) cmake rewrites config.h and the following make will pick it up
   as a change of dependency for a lot of files which #include "config.h"

pavanky/pocl,Oblomov/pocl,pocl/pocl,dsandersimgtec/pocl,franz/pocl,rjodin/pocl,vkorhonen/pocl,jrprice/pocl,vkorhonen/pocl,dsandersimgtec/pocl,vkorhonen/pocl,pavanky/pocl,pavanky/pocl,franz/pocl,pocl/pocl,Oblomov/pocl,franz/pocl,Oblomov/pocl,pocl/pocl,pocl/pocl,dsandersimgtec/pocl,rjodin/pocl,franz/pocl,dsandersimgtec/pocl,jrprice/pocl,Oblomov/pocl,pavanky/pocl,vkorhonen/pocl,rjodin/pocl,rjodin/pocl,pocl/pocl,franz/pocl,Oblomov/pocl,jrprice/pocl,jrprice/pocl