[gdb/testsuite] Fix gdb.base/ending-run.exp on manjaro linux
On aarch64-linux, using the manjaro linux distro, I run into:
...
(gdb) next^M
32 }^M
(gdb) next^M
0x0000fffff7d67b80 in ?? () from /usr/lib/libc.so.6^M
(gdb) FAIL: gdb.base/ending-run.exp: step out of main
...
What happens here is described in detail in this clause:
...
-re "0x.*\\?\\? \\(\\) from /lib/powerpc.*$gdb_prompt $" {
# This case occurs on Powerpc when gdb steps out of main and the
# needed debug info files are not loaded on the system, preventing
# GDB to determine which function it reached (__libc_start_call_main).
# Ideally, the target system would have the necessary debugging
# information, but in its absence, GDB's behavior is as expected.
...
}
...
but the clause only matches for powerpc.
Fix this by:
- making the regexp generic enough to also match /usr/lib/libc.so.6, and
- updating the comment to not mention powerpc.