Add jasmin as submodule because my branch cannot be build using nix-build

Makefile

@@ -1,8 +1,8 @@
-JC ?= jasminc
+JC ?= jasmin/compiler/jasminc
 CC ?= gcc
 MAKE ?= make
 
-.PHONY: clean run
+.PHONY: clean run $(JC)
 
 all: build
 	@true
@@ -16,5 +16,8 @@ build/%.o: build/%.S
 clean:
 	rm build/* 2> /dev/null || true
 
-build/%.S: src/%.jazz
+$(JC):
+	nix-shell jasmin/default.nix --command 'make -C jasmin/compiler CIL -j$(nproc) && make -C jasmin/compiler'
+
+build/%.S: src/%.jazz $(JC)
 	JASMINPATH="Jade=libjade/src/" $(JC) $< -o $@