gdb/testsuite: Remove duplicates from gdb.base/watchpoints.exp

When running the testsuite, I have:

    Running ../gdb/testsuite/gdb.base/watchpoints.exp ...
    DUPLICATE: gdb.base/watchpoints.exp: watchpoint hit, first time

Fix by adjusting the test names where appropriate.

Tested on x86_64-linux.
diff --git a/gdb/testsuite/gdb.base/watchpoints.exp b/gdb/testsuite/gdb.base/watchpoints.exp
index 3ccf068..d364ede 100644
--- a/gdb/testsuite/gdb.base/watchpoints.exp
+++ b/gdb/testsuite/gdb.base/watchpoints.exp
@@ -63,9 +63,9 @@
     set prev_timeout $timeout
     set timeout 600
 
-    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival1.*Old value = -1.*New value = 0.*ival1 = count; ival2 = count;.*" "watchpoint hit, first time"
+    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival1.*Old value = -1.*New value = 0.*ival1 = count; ival2 = count;.*" "watchpoint ival1 hit, first time"
 
-    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit, first time"
+    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint ival3 hit, first time"
 
     # Check that the ival3 hit count is reported correctly
     gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "watchpoint hit count is 1"