build: set LD_LIBRARY_PATH and GI_TYPELIB_PATH variables in run-nm-test.sh
With autotools, we use libtool so that the right libraries are automatically found. Still, we won't find the right GI typelib. Add a mechanism so that when make/meson invokes the run-nm-test.sh runner, it passes the build-root directory. Also, try to autodetect when invoked manually.
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