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Improve the m4 detection of cgal

Sebastian Ohlmannrequested to merge
improve_cgal_m4 into develop

Description

Use LIBS instead of LDFLAGS to make sure they come at the end of the link line which is important for the header-only version.

Moreover, --with-cgal=no disables the check now. Also don't check all the different folders - either it is CGAL_HOME, or given by --with-cgal or it is in the system folders. We don't need to cover anything else.

Also use AC_LINK_IFELSE instead of AC_RUN_IFELSE because it is also fine for cross compiling - here we don't really need to run the code; as long as it links, it is fine.

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