Luis Machado b9f90c72ee Fix timeout with maint print objfiles
I'm seeing timeouts from gdb.rust/traits.exp when we attempt to print
things with "maint print objfiles".

This happens for two reasons:

1 - GDB does not explicitly split each entry into its own line, but rather
    relies on the terminal's width to insert line breaks.

2 - When running the GDB testsuite, such width may be unlimited, which will
    prevent GDB from inserting any line breaks.

As a result, the output may be too lengthy and will come in big lines.  Tweak
the support library to match the patterns line-by-line, which gives us more
time to match things. Also fix GDB's output to print one entry per line,
regardless of the terminal width.

A similar approach was used in another testcase using the same command (commit
eaeaf44cfdc9a4096a0dd52fa0606f29d4bfd48e). With the new line breaks, we don't
need a particular pattern, so clean up that test as well.

gdb/ChangeLog:

2021-04-27  Luis Machado  <luis.machado@linaro.org>

	* psymtab.c (psymbol_functions::dump): Output newline.
	* symmisc.c (dump_objfile): Likewise.

gdb/testsuite/ChangeLog:

2021-04-27  Luis Machado  <luis.machado@linaro.org>

	* gdb.base/maint.exp: Drop a pattern that is not needed.
	* lib/gdb.exp (readnow): Match line-by-line.
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