[gdb/testsuite] Require python in gdb.server/server-kill-python.exp

I came across this when running test-case gdb.server/server-kill-python.exp
with a gdb configured without python:
...
builtin_spawn gdb -nw -nx -data-directory data-directory -iex set height 0 \
  -iex set width 0 -quiet -iex set height 0 -iex set width 0 \
  -ex source outputs/gdb.server/server-kill-python/file1.py^M
FAIL: gdb.server/server-kill-python.exp: ensure inferior is running
Executing on target: kill -9 28535    (timeout = 300)
builtin_spawn -ignore SIGHUP kill -9 28535^M
file1.py:1: Error in sourced command file:^M
Undefined command: "import".  Try "help".^M
...

Fix this by testing for python support in the test-case.

Tested on aarch64-linux (with python support disabled) and x86_64-linux (with
python support enabled).

1 files changed, 8 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.server/server-kill-python.exp b/gdb/testsuite/gdb.server/server-kill-python.exp
index 0a41df0..3e58c51 100644
--- a/gdb/testsuite/gdb.server/server-kill-python.exp
+++ b/gdb/testsuite/gdb.server/server-kill-python.exp
@@ -27,6 +27,14 @@ if {[skip_gdbserver_tests]} {
     return 0
 }
 
+# Gdb needs to be running for skip_python_tests, but exit once we're done,
+# we'll start a custom gdb after this.
+clean_restart
+if { [skip_python_tests] } {
+    return 0
+}
+gdb_exit
+
 if {[build_executable "failed to prepare" ${testfile} \
 	 ${srcfile}] == -1} {
     return -1