Update Makefile

Makefile

@@ -1,22 +1,27 @@
-all: dropbear.hmod
-dropbear.hmod: mod/bin/dropbear
-	chmod +x mod/bin/dropbear
-	tar -czvf dropbear.hmod -C mod bin etc
+all: out/dropbear.hmod
+out/dropbear.hmod: mod/bin/dropbear
+	[ -f "out/dropbear.hmod" ] || tar -czvf out/dropbear.hmod -C mod bin etc
+
 mod/bin/dropbear: src/dropbear-2015.68/dropbear
-	-mkdir -p mod/bin
+	mkdir -p mod/bin
 	[ -f mod/bin/dropbear ] || upx --ultra-brute src/dropbear-2015.68/dropbear -o mod/bin/dropbear
+	chmod +x mod/bin/dropbear
+
 src/dropbear-2015.68.tar.bz2:
-	mkdir src
+	mkdir -p src
 	wget https://github.com/DanTheMan827/dropbear.hmod/releases/download/tarballs/dropbear-2015.68.tar.bz2 -O src/dropbear-2015.68.tar.bz2
+
 src/dropbear-2015.68/configure: src/dropbear-2015.68.tar.bz2
 	[ -f src/dropbear-2015.68/configure ] || tar -xjvf src/dropbear-2015.68.tar.bz2 -C src/
+
 src/dropbear-2015.68/Makefile: src/dropbear-2015.68/configure 
 	cd src/dropbear-2015.68; \
 	./configure --host=arm-linux-gnueabihf --prefix=/ --disable-zlib CC=arm-linux-gnueabihf-gcc LD=arm-linux-gnueabihf-ld
+
 src/dropbear-2015.68/dropbear: src/dropbear-2015.68/Makefile
 	make -C src/dropbear-2015.68
+
 clean:
-	-rm dropbear.hmod
-	-rm mod/bin/dropbear
-	-rm -rf src
+	-rm -rf "out/" "mod/bin/dropbear" "src/"
+
 .PHONY: all clean