pkgsrc-installed libtool. Modify the configure script to grep the
libtool we're using for the values of various libtool-derived
variables. While here, fix the name of the variable that contains
the flags to pass linker options to the compiler.
* Drop the use of SUBST_FILES to directly substitute into cimcomp.c
and just patch the Makefile to pass the proper flags when compilng.
