test_pkgconfig_gen_deps: set PKG_CONFIG_SYSTEM_LIBRARY_PATH=/usr/lib

pkgconf automatically prunes "system library paths" from its output. The
system library paths depend on the system toolchain. A common value on a
64-bit system is as follows:

/lib64:/usr/lib64:/usr/local/lib64

So, if -L/usr/lib64 appears in the Libs section, it will be pruned from
the output of pkg-config --libs.

The pc files generated for this test contain something like this:

libdir=/usr/lib
Libs: -L${libdir} ...

pkgconf may not consider /usr/lib to be a system library path, so it is
not pruned as the test expects. To work around this, override the
compiled-in list of paths via the PKG_CONFIG_SYSTEM_LIBRARY_PATH
environment variable.

Fixes: https://github.com/mesonbuild/meson/issues/6004

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