gdb/testsuite: Don't allow paths to appear in test name

Having paths in the test names makes it harder to compare results
between two runs in different directories.  Give the test a name so
that the path doesn't appear.

gdb/ChangeLog:

	* gdb.base/style.exp: Don't include path in testname.

gdb/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2019-01-12  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* gdb.base/style.exp: Don't include path in testname.
+
 2019-01-10  Keith Seitz  <keiths@redhat.com>
 
 	PR gdb/23712

gdb/testsuite/gdb.base/style.exp

@@ -54,4 +54,5 @@ save_vars { env(TERM) } {
     set quoted [string_to_regexp $binfile]
     gdb_test "file $binfile" \
 	"Reading symbols from \033\\\[32m${quoted}\033\\\[m..." \
+	"filename is styled when loading symbol file"
 }