Define line ending style for different file types

Additionally, fix line endings on some files that were inconsistent
in this regard.

This gives a more consistent experience on all development
platforms.

All source files (be it scripts, makefiles, autoconf/automake
files,...) are given an explicit line ending style. For most
LF was chosen. Exceptions are typical windows scripts (.bat, .cmd,
.vbs,...) and some files related to the windows installer. Those
are fixed at CTRL/LF because the installer would have issues
otherwise).
The remainder of files are mostly plain text files (README's,
CHANGELOG's,...). These files are stored with LF line ending
in the repo, but checked out with the platform's native
line ending style. git takes proper care of the necessary
conversions automatically.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22712 57a11ea4-9604-0410-9ed3-97b8803252fd
Win32 build: remove obsolete patches

The code used to apply the patches if present still remains to cater for
possible future patches.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22713 57a11ea4-9604-0410-9ed3-97b8803252fd