Fix building of static binaries

It's a bit ugly, but appears to work. I've not tested the 32bit arm
version, but the others run.

The static binaries are about twice as large as the ncdu 1.x
counterparts.

Makefile

@@ -55,8 +55,6 @@ dist: doc
 
 
 # ASSUMPTION: the ncurses source tree has been extracted into ncurses/
-# BUG: Zig writes to zig-* in this directory, not the TARGET-specific build one.
-# BUG: Doesn't seem to do any static linking :(
 static:
 	mkdir -p static-${TARGET}/nc static-${TARGET}/inst/pkg
 	cd static-${TARGET}/nc && ../../ncurses/configure --prefix="`pwd`/../inst"\
@@ -70,16 +68,21 @@ static:
 		LD="zig cc --target=${TARGET}"\
 		AR="zig ar" RANLIB="zig ranlib"\
 		CPPFLAGS=-D_GNU_SOURCE && make && make install.libs
-	cd static-${TARGET} && PKG_CONFIG_LIBDIR="`pwd`/inst/pkg" zig build -Dtarget=${TARGET}\
-		--build-file ../build.zig --search-prefix inst/ --cache-dir zig -Drelease-fast=true
-	@# Alternative approach, bypassing zig-build, but this still refuses to do static linking ("UnableToStaticLink")
-	@# cd static-${TARGET} && zig build-exe -target ${TARGET} -lc -Iinst/include -Iinst/include/ncursesw -Linst/lib -lncursesw -static ../src/main.zig ../src/ncurses_refs.c
-	#rm -rf static-${TARGET}
+	@# zig-build - cleaner approach but doesn't work, results in a dynamically linked binary.
+	@#cd static-${TARGET} && PKG_CONFIG_LIBDIR="`pwd`/inst/pkg" zig build -Dtarget=${TARGET}
+	@#	--build-file ../build.zig --search-prefix inst/ --cache-dir zig -Drelease-fast=true
+	@# Alternative approach, bypassing zig-build
+	cd static-${TARGET} && zig build-exe -target ${TARGET}\
+		-Iinst/include -Iinst/include/ncursesw -lc inst/lib/libncursesw.a\
+		--cache-dir zig-cache -static --strip -O ReleaseFast ../src/main.zig ../src/ncurses_refs.c
+	cd static-${TARGET} && mv main ncdu && tar -czf ../ncdu-${NCDU_VERSION}-$(shell echo ${TARGET} | sed s/-musl//).tar.gz ncdu
+	rm -rf static-${TARGET}
 
 static-target-%:
 	$(MAKE) static TARGET=$*
 
 static-all:\
-	# static-target-x86_64-linux-musl \ # Works, but doesn't link statically
-	# static-target-aarch64-linux-musl \ # Same
-	# static-target-i386-linux-musl # Broken, linker errors
+	static-target-x86_64-linux-musl \
+	static-target-aarch64-linux-musl \
+	static-target-i386-linux-musl \
+	static-target-arm-linux-musleabi