[pushed] [gdb/testsuite] Require allow_xml_test in gdb.base/gcore.exp

I build gdb without xml support, and with test-case gdb.base/gcore.exp ran
into:
...
(gdb) core $outputs/gdb.base/gcore/gcore.test
warning: Can not parse XML target description; \
  XML support was disabled at compile time
  ...
(gdb) FAIL: $exp: corefile restored general registers
...

Fix this by requiring allow_xml_test.
---
 gdb/testsuite/gdb.base/gcore.exp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gdb/testsuite/gdb.base/gcore.exp b/gdb/testsuite/gdb.base/gcore.exp
index 243e0b39082..5937137f4ee 100644
--- a/gdb/testsuite/gdb.base/gcore.exp
+++ b/gdb/testsuite/gdb.base/gcore.exp
@@ -17,6 +17,7 @@
 # This is a test for the gdb command "generate-core-file".
 
 require gcore_cmd_available
+require allow_xml_test
 
 standard_testfile
 

base-commit: 44eca7e071af1233d7a9a2a04e059f2f2866f947
-- 
2.51.0