[gdb/testsuite] Fix info-types.exp for debug info from more than one file

[gdb/testsuite] Fix info-types.exp for debug info from more than one file

On openSUSE Leap 15.0, I get:
...
FAIL: gdb.base/info-types.exp: l=c: info types
FAIL: gdb.base/info-types.exp: l=c++: info types
...
because the info type command prints info for files info-types.c, stddef.h,
elf-init.c and init.c, while the regexp in the test-case expect only info for
info-types.c.

Fix this by extending the regexp.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-07-24  Tom de Vries  <tdevries@suse.de>

	* gdb.base/info-types.exp: Allow info types to print info for more than
	one file.