Add Emscripten/WASM support

bin/makefile-emscripten.wasm-wasm

@@ -0,0 +1,19 @@
+# Options for Emscripten, WASM and SDL
+
+CC = emcc -sUSE_SDL=2 -sASYNCIFY -sALLOW_MEMORY_GROWTH $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)sdl.o
+
+XFLAGS = -DSDL
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351
+
+LD = emcc
+LDFLAGS = -sUSE_SDL=2 --preload-file $(SYSOUT)@full.sysout
+LDELDFLAGS =
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldesdl.js

bin/makeright

@@ -74,6 +74,11 @@ case "$display" in
 	sdl)	releasename=${osversion}.${architecture}-${display}
 		ldename=ldesdl
 		;;
+	wasm)	osversion=emscripten
+		architecture=wasm
+		releasename=${osversion}.${architecture}-${display}
+		ldename=ldesdl.js
+		;;
 	*)	echo "display-option: $display is not supported."
 		exit
 		;;