chore(asm): avoid bundling unneeded ddwaf lib builds for other architectures (#5239)

Bundle only appropriate libddwaf builds into our ddtrace wheels

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/contributing.html#Release-Note-Guidelines)
are followed.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Author is aware of the performance implications of this PR as
reported in the benchmarks PR comment.

## Reviewer Checklist

- [ ] Title is accurate.
- [ ] No unnecessary changes are introduced.
- [ ] Description motivates each change.
- [ ] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [ ] Testing strategy adequately addresses listed risk(s).
- [ ] Change is maintainable (easy to change, telemetry, documentation).
- [ ] Release note makes sense to a user of the library.
- [ ] Reviewer is aware of, and discussed the performance implications
of this PR as reported in the benchmarks PR comment.

---------

Co-authored-by: Alberto Vara <[email protected]>
Co-authored-by: Juanjo Alvarez Martinez <[email protected]>

Author: 3 people

setup.py

@@ -119,6 +119,20 @@ def run_tests(self):
         sys.exit(errno)
 
 
+def is_64_bit_python():
+    return sys.maxsize > (1 << 32)
+
+
+class CleanLibraries(CleanCommand):
+    @staticmethod
+    def remove_dynamic_library():
+        shutil.rmtree(LIBDDWAF_DOWNLOAD_DIR, True)
+
+    def run(self):
+        CleanLibraries.remove_dynamic_library()
+        CleanCommand.run(self)
+
+
 class LibDDWaf_Download(BuildPyCommand):
     @staticmethod
     def download_dynamic_library():
@@ -138,11 +152,20 @@ def download_dynamic_library():
         if not os.path.isdir(LIBDDWAF_DOWNLOAD_DIR):
             os.makedirs(LIBDDWAF_DOWNLOAD_DIR)
 
-        build_platform = get_build_platform()
         for arch in AVAILABLE_RELEASES[CURRENT_OS]:
-            if CURRENT_OS == "Darwin" and not build_platform.endswith(arch):
+            if CURRENT_OS == "Linux" and not get_build_platform().endswith(arch):
                 # We cannot include the dynamic libraries for other architectures here.
                 continue
+            elif CURRENT_OS == "Darwin":
+                # Detect build type for macos:
+                # https://github.com/pypa/cibuildwheel/blob/main/cibuildwheel/macos.py#L250
+                target_platform = os.getenv("PLAT")
+                # Darwin Universal2 should bundle both architectures
+                if not target_platform.endswith(("universal2", arch)):
+                    continue
+            elif CURRENT_OS == "Windows" and (not is_64_bit_python() != arch.endswith("32")):
+                # Win32 can be built on a 64-bit machine so build_platform may not be relevant
+                continue
 
             arch_dir = os.path.join(LIBDDWAF_DOWNLOAD_DIR, arch)
 
@@ -189,20 +212,11 @@ def download_dynamic_library():
             os.remove(filename)
 
     def run(self):
+        CleanLibraries.remove_dynamic_library()
         LibDDWaf_Download.download_dynamic_library()
         BuildPyCommand.run(self)
 
 
-class CleanLibraries(CleanCommand):
-    @staticmethod
-    def remove_dynamic_library():
-        shutil.rmtree(LIBDDWAF_DOWNLOAD_DIR, True)
-
-    def run(self):
-        CleanLibraries.remove_dynamic_library()
-        CleanCommand.run(self)
-
-
 long_description = """
 # dd-trace-py