[gdb/testsuite] Fix info-var.exp for debug info from other files

On openSUSE Leap 15.1, I get:
...
FAIL: gdb.base/info-var.exp: info variables
FAIL: gdb.base/info-var.exp: info variables -n
...
because the info variables command prints info also for init.c:
...
File init.c:^M
24:     const int _IO_stdin_used;^M
...
while the regexps in the test-case only expect info for info-var-f1.c and
info-var-f2.c.

Fix this by extending the regexps.

Tested on x86_64-linux, both openSUSE Leap 15.1 and Fedora 30.

gdb/testsuite/ChangeLog:

2019-08-28  Tom de Vries  <tdevries@suse.de>

	* gdb.base/info-var.exp: Allow info variables to print info for files
	other than info-var-f1.c and info-var-f2.c.

---
 gdb/testsuite/gdb.base/info-var.exp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/gdb/testsuite/gdb.base/info-var.exp b/gdb/testsuite/gdb.base/info-var.exp
index 5a07d6214d..6dd896d8aa 100644
--- a/gdb/testsuite/gdb.base/info-var.exp
+++ b/gdb/testsuite/gdb.base/info-var.exp
@@ -37,7 +37,10 @@ gdb_test "info variables" \
 	 "File .*${srcfile2}:" \
 	 "18:\[ \t\]+int global_var;" \
 	 "20:\[ \t\]+static int f2_var;" \
-	 "" \
+	 "(" \
+	 "File .*:(" \
+	 "$decimal:.*" \
+	 ")+)*" \
 	 "Non-debugging symbols:" \
 	 ".*"]
 
@@ -50,7 +53,10 @@ gdb_test "info variables -n" \
 	 "" \
 	 "File .*${srcfile2}:" \
 	 "18:\[ \t\]+int global_var;" \
-	 "20:\[ \t\]+static int f2_var;" ]
+	 "20:\[ \t\]+static int f2_var;(" \
+	 "" \
+	 "File .*:(" \
+	 "$decimal:.*)+)*"]
 
 gdb_test "info variables -n global" \
     [multi_line \