Build system fixes
This branch contains several small fixes and an update the the cross-compilation script for MS Windows. It
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Fixes a missing first argument from two fprintf statements in mbc.c
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Fixes the use of pkg-config in configure.ac (used for GiNaC). Instead it uses the PKG_PROG_PKG_CONFIG macro, which sets a variable, PKG_CONFIG, to the name of the correct pkg-config program. This is relevant when, e.g. cross-compiling where a non-standard pkg-config might be used.
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Checks for alternate netcdf_C++4 lib name (this can be libnetcedf-cxx4, or at least it was in my cross-compilation toolchain). It now checks for both lib names.
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Updates the windows cross-compile script to add support for GiNaC, plus many other improvements
Edited by Richard Crozier