when mangling gcc output, make sure we distinguish between a \ at EOL and a \ in DOS paths

Since 'gcc -E' is the CPP we're now using, make good use of its
support for directly generating dependencies.

Oops, accidentally downgraded these files in the previous commit.

Move 4.01 onto the main trunk.

add -s option for extra obj suffixes, like mkdependHS

Don't feed mkdependC -D__GNUC__ + fix-fix to mkdependC

Delete temp files when through with it

fix SCRIPT_SUBST_VARS.

Use $(CPP), not $(RAWCPP).  This involves saving the cpp output to a
temporary file.  This change should fix 'make depend' on RedHat 5.

When needed , define __linux__ to silence cpp warnings

cygwin32 hacks

Use eval exec .. trick rather than #!

Catch (another) gcc include file site

Major update to more-or-less 2.02

New Build System!