Added web support and wasm binaries

.github/workflows/gdextension_build.yml

@@ -154,7 +154,7 @@ jobs:
         target: [template_debug, template_release]
 
     env:
-      EM_VERSION: 1.39.18
+      EM_VERSION: 3.1.46
 
     steps:
       - name: Checkout

patches/fixed_javascript_build.patch

@@ -1,19 +1,19 @@
 diff --git a/tools/javascript.py b/tools/javascript.py
-index 42c601d..2dbb4dc 100644
+index 42c601d..8fcb921 100644
 --- a/tools/javascript.py
 +++ b/tools/javascript.py
-@@ -1,8 +1,8 @@
+@@ -1,18 +1,14 @@
  import os
 -
 +from SCons.Util import WhereIs
 
  def exists(env):
 -    return "EM_CONFIG" in os.environ
+-
 +    return WhereIs("emcc") is not None
 
-
  def generate(env):
-@@ -10,9 +10,6 @@ def generate(env):
+     if env["arch"] not in ("wasm32"):
          print("Only wasm32 supported on web. Exiting.")
          Exit()
 
@@ -23,7 +23,21 @@ index 42c601d..2dbb4dc 100644
      env["CC"] = "emcc"
      env["CXX"] = "em++"
      env["AR"] = "emar"
-@@ -39,9 +36,9 @@ def generate(env):
+@@ -26,6 +22,13 @@ def generate(env):
+     env["ARCOM_POSIX"] = env["ARCOM"].replace("$TARGET", "$TARGET.posix").replace("$SOURCES", "$SOURCES.posix")
+     env["ARCOM"] = "${TEMPFILE(ARCOM_POSIX)}"
+
++    # Thread support (via SharedArrayBuffer).
++    env.Append(CPPDEFINES=["PTHREAD_NO_RENAME"])
++    env.Append(CCFLAGS=["-s", "USE_PTHREADS=1"])
++    env.Append(LINKFLAGS=["-s", "USE_PTHREADS=1"])
++    env.Append(LINKFLAGS=["-s", "PTHREAD_POOL_SIZE=8"])
++    env.Append(LINKFLAGS=["-s", "WASM_MEM_MAX=2048MB"])
++
+     # All intermediate files are just LLVM bitcode.
+     env["OBJPREFIX"] = ""
+     env["OBJSUFFIX"] = ".bc"
+@@ -39,9 +42,9 @@ def generate(env):
      env.Replace(SHLINKFLAGS="$LINKFLAGS")
      env.Replace(SHLINKFLAGS="$LINKFLAGS")