Changes

Some minor cleaning up.
 (commit: 1ae3f62)

Make sure that our runpath2rpath program gets compiled with full
optimisations.
 (commit: 32cc3bc)

Make sure that we can take advantage of clcache, if it is installed.
 (commit: 146caa1)

Make sure that we can take advantage of clcache, if it is installed.
 (commit: 2889808)

Make sure that we can take advantage of clcache, if it is installed.
 (commit: 41dca11)

Make sure that CMake doesn't force us to use the compilation flags it
wants us to use.
 (commit: 686eb75)

Make sure that we can take advantage of clcache, if it is installed.
Although clcache doesn't currently support the /Zi comiler option, it
does actually support the /Z7 one (since that option doesn't generate
.PDB files, which is the reason clcache doesn't currently support the
/Zi compiler option).
 (commit: 0345eb6)