Relink web build when HTML shell changes

Emscripten injects its loader script when linking, so force relinking
whenever the HTML shell changes.

Also remove useless FULL_ES2 flag, which should be a linker flag, but
would impact performance too much.

platform/javascript/SCsub

@@ -22,6 +22,7 @@ env.Append(LINKFLAGS=["-s", "EXPORTED_FUNCTIONS=\"['_main','_audio_server_mix_fu
 env.Append(LINKFLAGS=["--shell-file", '"platform/javascript/godot_shell.html"'])
 
 build = env.Program('#bin/godot', javascript_objects, PROGSUFFIX=env["PROGSUFFIX"] + ".html")
+Depends(build, "godot_shell.html")
 
 def make_html_shell(target, source, env):
     html_path = target[0].rstr()

platform/javascript/detect.py

@@ -81,7 +81,6 @@ def configure(env):
     env.Append(CPPFLAGS=['-DJAVASCRIPT_ENABLED', '-DUNIX_ENABLED', '-DPTHREAD_NO_RENAME', '-DNO_FCNTL', '-DMPC_FIXED_POINT', '-DTYPED_METHOD_BIND', '-DNO_THREADS'])
     env.Append(CPPFLAGS=['-DGLES2_ENABLED'])
     env.Append(CPPFLAGS=['-DGLES_NO_CLIENT_ARRAYS'])
-    env.Append(CPPFLAGS=['-s', 'FULL_ES2=1'])
 #	env.Append(CPPFLAGS=['-DANDROID_ENABLED', '-DUNIX_ENABLED','-DMPC_FIXED_POINT'])
 
     if env['wasm'] == 'yes':