harden ipc and frontend recovery

gtk/Makefile

@@ -2,8 +2,8 @@ CFLAGS = -Wall -O2 -I.. `pkg-config --cflags gtk+-3.0`
 LDFLAGS = `pkg-config --libs gtk+-3.0`
 DSTDIR ?= $(shell find /usr/lib* -type d -path "*/gtk-3.0/*/immodules" 2>/dev/null | head -1)
 
-im-strans.so: main.c
-	$(CC) -shared -fPIC $(CFLAGS) -o $@ $< $(LDFLAGS)
+im-strans.so: main.c ../ipc.c ../ipc.h
+	$(CC) -shared -fPIC $(CFLAGS) -o $@ main.c ../ipc.c $(LDFLAGS)
 
 docker: main.c Dockerfile
 	docker build -t strans-gtk .