wasm: Embed config and help directories

In order to give the wasm application access to the help and
configuration files, add the `--embed-file` arguments

Authored-by:  Jesus Cano <jcanovel@gmail.com>
Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>
Reviewed-by: Christophe de Dinechin <christophe@dinechin.org>

Author: jpcano

Makefile

@@ -453,8 +453,9 @@ LDFLAGS +=	-s MODULARIZE=0				\
 		-s RESERVED_FUNCTION_POINTERS=20	\
 		-s PTHREAD_POOL_SIZE=4			\
 		--bind -pthread \
-		-sASYNCIFY # Used to be able to sleep within a webassembly context
-
+		--embed-file config \
+		--embed-file help \
+		-sASYNCIFY # Used to be able to sleep within a webassembly conte
 #------------------------------------------------------------------------------
 else
 #------------------------------------------------------------------------------