Revert "buildsystem: add $EXESUF to the used tool for fate"

This reverts commit 668a74e8.
10l, this change was unneeded, target_exec can be used to achive the same.

tests/Makefile

@@ -137,7 +137,7 @@ fate:: $(FATE)
 
 $(FATE): $(TOOL)$(EXESUF) $(FATE_UTILS:%=tests/%$(HOSTEXESUF))
 	@echo "TEST    $(@:fate-%=%)"
-	$(Q)$(SRC_PATH)/tests/fate-run.sh $@ "$(SAMPLES)" "$(TARGET_EXEC)" "$(TARGET_PATH)" '$(CMD)' '$(CMP)' '$(REF)' '$(FUZZ)' '$(THREADS)' '$(THREAD_TYPE)' '$(TOOL)$(EXESUF)'
+	$(Q)$(SRC_PATH)/tests/fate-run.sh $@ "$(SAMPLES)" "$(TARGET_EXEC)" "$(TARGET_PATH)" '$(CMD)' '$(CMP)' '$(REF)' '$(FUZZ)' '$(THREADS)' '$(THREAD_TYPE)' '$(TOOL)'
 
 fate-list:
 	@printf '%s\n' $(sort $(FATE))