[Patch-gnuradio] 4 small patches for Cygwin

[Don Ward]

Here are four small patches for Cygwin.  With these patches, the latest 
trunk (or is it origin/master?) builds and passes make check (as of 
10/06/09).

Briefly, the changes are:

(1) Add *.exe to .gitignore. (Cygwin produces these for test executables.)

(2) Restore ac_compiler in gr_fortran.m4 even when no Fortran was found.

(3) Add $(NO_UNDEFINED) to LDFLAGS in atsc Makefile.am, so shared libraries 
will be built.

(4) Change the order of searching pmt/libpmt-qa.la and libgruel.la in gruel 
Makefile.am so references to libgruel from limpmt-qa will be resolved.

-- Don W.

git091005.patch
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