build: get rid of vestigial Makefile.config test

We don't use this any more (and the test was deleted in a previous patch),
so let's get rid of this too.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile.config

@@ -35,9 +35,6 @@ endif
 ifeq ($(call try-cc,$(PTRACE_PEEKSIGINFO_TEST),),y)
 	$(Q) @echo '#define CONFIG_HAS_PEEKSIGINFO_ARGS' >> $@
 endif
-ifeq ($(call try-cc,$(PTRACE_SUSPEND_SECCOMP_TEST),),y)
-	$(Q) @echo '#define CONFIG_HAS_SUSPEND_SECCOMP' >> $@
-endif
 ifeq ($(VDSO),y)
 	$(Q) @echo '#define CONFIG_VDSO' >> $@
 endif