Emscripten: don't use a memory init file any more.

It doesn't take that long to load the module, and it's going to make
users' life way easier.

configure.ac

@@ -423,7 +423,7 @@ AC_SUBST([LIBTOOL_EXTRA_FLAGS])
 TEST_LDFLAGS=''
 AS_IF([test "x$EMSCRIPTEN" != "x"],[
   EXEEXT=.js
-  TEST_LDFLAGS='--pre-js pre.js.inc -s RESERVED_FUNCTION_POINTERS=8'
+  TEST_LDFLAGS='--memory-init-file 0 --pre-js pre.js.inc -s RESERVED_FUNCTION_POINTERS=8'
 ])
 AC_SUBST(TEST_LDFLAGS)
 AM_CONDITIONAL([EMSCRIPTEN], [test "x$EMSCRIPTEN" != "x"])

dist-build/emscripten.sh

@@ -13,7 +13,7 @@ emconfigure ./configure --enable-minimal --disable-shared --prefix="$PREFIX" \
   CFLAGS="-O3" && \
 emmake make clean && \
 emmake make $MAKE_FLAGS install V=1 && \
-emcc -O3 --closure 1 --llvm-lto 1 $LDFLAGS $JS_EXPORTS_FLAGS \
+emcc -O3 --closure 1 --llvm-lto 1 --memory-init-file 0 $LDFLAGS $JS_EXPORTS_FLAGS \
   "${PREFIX}/lib/libsodium.a" -o "${PREFIX}/lib/libsodium.js" || exit 1
 
 if test "x$NODE" = x; then