[gdb/testsuite] Use support_displaced_stepping in gdb.arch/amd64-disp-step-avx.exp
In commit 8e73fddeb0d ("[gdb/testsuite] Fix gdb.arch/amd64-disp-step-avx.exp
on x86_64-freebsd") I added a "require {istarget *-*-linux*}", but since then
I found support_displaced_stepping, which seems more appropriate and
descriptive.
Fix this by requiring support_displaced_stepping instead.
Tested on x86_64-freebsd.
diff --git a/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp b/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
index 3977982..b11efa7 100644
--- a/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
+++ b/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
@@ -19,7 +19,7 @@
# instructions.
require is_x86_64_m64_target have_avx
-require {istarget *-*-linux*}
+require support_displaced_stepping
standard_testfile .S
