[tlbuild] Fail to set macros in c-auto.h for MinGW -- if not build in source tree

[Yung-Jang Lee]

After study 'config.status' and 'defines.awk' files generated in
'texk/kpathsea' directory,  I find that the rule in 'defines.awk' can not
detect pattern in 'c-auto.h' file due to CRLF terminate  the end of a line
in Windows system that different in Unix system.

And I find a  web page discuss this subject  'config.status produces
incompatible defines.awk and config.h' in

http://lists.gnu.org/archive/html/bug-autoconf/2010-09/msg00000.html

It look like in Windows/MinGW , the  script file  'defines.awk' do not work
well due to CRLF termination of a line.

Could someone suggest a way to work around ?
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