Switch from napa to curl

Instead of using 127 deps brought by napa just to download the one dependency we actually care about, just use curl & tar directly from Makefile.

codecs/imagequant/Makefile

@@ -1,3 +1,4 @@
+CODEC_URL := https://github.com/ImageOptim/libimagequant/archive/2.12.1.tar.gz
 CODEC_DIR := node_modules/libimagequant
 CODEC_OUT_RELATIVE := libimagequant.a
 CODEC_OUT := $(addprefix $(CODEC_DIR)/, $(CODEC_OUT_RELATIVE))
@@ -28,6 +29,12 @@ $(CODEC_DIR)/config.mk: $(CODEC_DIR)/configure
 	cd $(CODEC_DIR) && ./configure \
 		--disable-sse
 
+$(CODEC_DIR)/configure: $(CODEC_DIR)
+
+$(CODEC_DIR):
+	mkdir -p $@
+	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@
+
 clean:
 	$(RM) $(OUT_JS) $(OUT_WASM)
 	$(MAKE) -C $(CODEC_DIR) clean

codecs/imagequant/package.json

@@ -1,13 +1,6 @@
 {
   "name": "imagequant",
   "scripts": {
-    "install": "napa",
     "build": "../build-cpp.sh"
-  },
-  "napa": {
-    "libimagequant": "ImageOptim/libimagequant#2.12.1"
-  },
-  "devDependencies": {
-    "napa": "3.0.0"
   }
 }