From Axel:

Include build/pch.d to trigger PCH generation after dummy.d
precompile.d now generates dependency for PCH, not .o
rmkdepend now updates the .d file time properly, even on windows.
Link against precompile.o only when not building a build tool.
Assume ALLHDRS is satisfied when generating the PCH.
Remove MSVC -Yl flag, didn't help against LNK4206 warning.

Also new and unrelated:
If config.status changes, reconfigure (handy to change a config flag).
If building inside an IDE, run configure automatically if not done yet.
Disable MSVC compiler and linker warnings, one each.
For MSVC8, use PDB (gets rid of these annoying linker warnings that one
cannot disable).

The IDE stuff is needed for the future windows build environment, where
people don't need cygwin anymore.


git-svn-id: http://root.cern.ch/svn/root/trunk@14384 27541ba8-7e3a-0410-8455-c3a389f83636