libgcobol: C++-ify the configuration steps.

libgcobol: C++-ify the configuration steps.

Currently, the library is configured as if it was written in C, however
all the sources are C++, so update to use C++ as the configure language
(and check the CXX instead of CC).

Reorder the configuration steps so that we setup the tools and environment
before carrying out tests.

Remove unused configuration machinery.

Also we configured extra ld flags but never used them. There is no need
to make these extra_ldflags darwin-specific, additions could be required
by other hosts.

libgcobol/ChangeLog:

	* aclocal.m4: Regenerate.
	* config.h.in: Regenerate.
	* Makefile.am: Use the configured LIBS and extra_ldflags.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Shift configure to use c++. Order tests for tools
	and environment before other tests.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>