[Patch-gnuradio] make configure.ac work with libtool 2.2

[Don Ward]

Libtool 2.2 appears to correctly handle interlibrary dependencies on Cygwin 
and MinGW.  With libtool 2.2, we no longer need to apply patches to 
Makefiles before building on these systems.

Using libtool 2.2 with the current configure.ac produces many lines of 
warnings when the newly-deprecated AC_PROG_LIBTOOL macro is used in 
conjunction with certain other macros (such as GR_FORTRAN).  We can avoid 
the warnings and still be able to use either libtool 1.5 or 2.2 with the 
attached one-line patch to configure.ac.  This should be considered a 
temporary measure until we are ready to require users who need to run 
bootstrap to upgrade to libtool 2.2.

It would be convenient for Cygwin and MinGW users if future release tarballs 
were prepared using libtool 2.2.  This would eliminate the need for tarball 
users to install autotools and run ./bootstrap.

-- Don W.

configure_ac.patch
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