[testsuite, obvious] fix pathname regexp in gdb.base/solib-vanish.exp

[Sandra Loosemore <sandra@codesourcery.com>]

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When cross-debugging from Windows host, names of source files typically 
print without a directory prefix.  So I was getting a spurious failure like:

Breakpoint 2, bar (y=1) at solib-vanish-lib2.c:21
21        return y + 1;                 /* break here */
(gdb) FAIL: gdb.base/solib-vanish.exp: continue to breakpoint: bar

because the regexp expected a "/" in the filename.  This is easy to fix, 
and in fact in the past I've committed a number of similar patches to 
adjust other testcases expecting a directory prefix as well.  So I've 
committed this one as obvious.

-Sandra

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commit d4330bde6891c74498cea8866ce9992181798861
Author: Sandra Loosemore <sandra@codesourcery.com>
Date:   Thu Oct 11 16:51:26 2018 -0700

    Fix pathname regexp in gdb.base/solib-vanish.exp.
    
    2018-10-11  Sandra Loosemore  <sandra@codesourcery.com>
    
    	gdb/testsuite/
    	* gdb.base/solib-vanish.exp: Fix regexp not to require a POSIX
    	directory prefix on the filename.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index f907323..ba5fae9 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-10-11  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* gdb.base/solib-vanish.exp: Fix regexp not to require a POSIX
+	directory prefix on the filename.
+
 2018-10-10  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* gdb.gdb/unittest.exp: Update expected message informing that
diff --git a/gdb/testsuite/gdb.base/solib-vanish.exp b/gdb/testsuite/gdb.base/solib-vanish.exp
index 928ca4e..a243d3d 100644
--- a/gdb/testsuite/gdb.base/solib-vanish.exp
+++ b/gdb/testsuite/gdb.base/solib-vanish.exp
@@ -98,7 +98,7 @@ gdb_breakpoint "${lib2name}.c:${lib2_lineno}" {allow-pending}
 
 # Verify that both the location and source code are displayed
 gdb_continue_to_breakpoint "bar" \
-    ".*/${lib2name}.c:${lib2_lineno}.*break here.*"
+    ".*${lib2name}.c:${lib2_lineno}.*break here.*"
 
 # This should not segfault
 gdb_test "next" \