fix: avoid using './' in local jco path for windows build

Signed-off-by: Victor Adossi <vadossi@cosmonic.com>

Author: vados-cosmonic

Makefile

@@ -1,5 +1,5 @@
 # WASM_OPT ?= $(shell rm node_modules/.bin/wasm-opt ; which wasm-opt)
-JCO ?= ./node_modules/.bin/jco
+JCO ?= node ./node_modules/.bin/jco
 STARLINGMONKEY_SRC ?= StarlingMonkey
 
 ifndef JCO