ver_linux: Query ld cache for versions of libc/libcpp run-time

Query ld cache for versions of both libc and libcpp run-time, instead
of querying /proc/self/maps for libc run-time, and ld cache for libcpp
run-time, thus reducing code size and complexity.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com>
Link: https://lore.kernel.org/r/20200209140057.20181-1-alexander.kapshuk@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>