Make --build_wasm_static_lib implicitly enable --build_wasm

When --build_wasm_static_lib is specified, treat --build_wasm as
implicitly enabled. This is done in build_args.py's post-processing
section, before the cmake generator is selected, so that all
downstream logic correctly recognizes this as a wasm build.

The redundant check in build.py is removed since it's now handled
earlier in the argument parsing phase.

Fixes #27313

Co-authored-by: fs-eire <7679871+fs-eire@users.noreply.github.com>

Author: Copilot

tools/ci_build/build.py

@@ -2346,9 +2346,6 @@ def main():
         if args.nnapi_min_api < 27:
             raise BuildError("--nnapi_min_api should be 27+")
 
-    if args.build_wasm_static_lib:
-        args.build_wasm = True
-
     if args.build_wasm:
         if not args.disable_wasm_exception_catching and args.disable_exceptions:
             # When '--disable_exceptions' is set, we set '--disable_wasm_exception_catching' as well

tools/ci_build/build_args.py

@@ -935,6 +935,10 @@ def convert_arg_line_to_args(self, arg_line: str) -> list[str]:  # Use list[str]
     if args.android_ndk_path:
         args.android_ndk_path = os.path.normpath(args.android_ndk_path)
 
+    # Treat --build_wasm_static_lib as implying --build_wasm
+    if args.build_wasm_static_lib:
+        args.build_wasm = True
+
     # Handle WASM exception logic
     if args.enable_wasm_api_exception_catching:
         args.disable_wasm_exception_catching = True  # Catching at API level implies disabling broader catching