gdb/testsuite: Add a missing -wrap in gdb_test_multiple

In commit:

  commit faeb9f13c1
  Date:   Wed Feb 24 12:50:00 2021 +0000

      gdb/fortran: add support for ASSOCIATED builtin

A test was added that fails to process the trailing gdb prompt inside
a gdb_test_multiple call, this will cause a failure if the tests are
run with READ1=1, or randomly at other times depending on how the
expect buffers are read in.

Fixed by adding a -wrap argument.

gdb/testsuite/ChangeLog:

	* gdb.fortran/associated.exp: Add missing '-wrap' argument.

gdb/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2021-02-25  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* gdb.fortran/associated.exp: Add missing '-wrap' argument.
+
 2021-02-25  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	PR fortran/26155

gdb/testsuite/gdb.fortran/associated.exp

@@ -45,7 +45,7 @@ while { $test_count < 500 } {
 	    -re -wrap "! Test Breakpoint" {
 		# We can run a test from here.
 	    }
-	    -re "! Final Breakpoint" {
+	    -re -wrap "! Final Breakpoint" {
 		# We're done with the tests.
 		set found_final_breakpoint true
 	    }