Re-land "[lldb] Pick the builder for the target platform (#151262)"

Pick the builder for the target platform, not the host platform. This is
necessary when running the test suite remotely on a different platform.
Unlike for Darwin, both Windows and Linux us the default builder, which
is why this went unnoticed on the remote-linux bots.

Author: JDevlieghere

lldb/packages/Python/lldbsuite/test/builders/__init__.py

@@ -8,7 +8,15 @@
 
 def get_builder(platform):
     """Returns a Builder instance for the given platform."""
-    if platform == "darwin":
+    if platform in [
+        "bridgeos",
+        "darwin",
+        "ios",
+        "macosx",
+        "tvos",
+        "watchos",
+        "xros",
+    ]:
         from .darwin import BuilderDarwin
 
         return BuilderDarwin()

lldb/packages/Python/lldbsuite/test/lldbplatformutil.py

@@ -229,7 +229,8 @@ def hasChattyStderr(test_case):
 
 
 def builder_module():
-    return get_builder(sys.platform)
+    """Return the builder for the target platform."""
+    return get_builder(getPlatform())
 
 
 def getArchitecture():

lldb/packages/Python/lldbsuite/test/lldbtest.py

@@ -1517,7 +1517,7 @@ def build(
         testname = self.getBuildDirBasename()
 
         module = builder_module()
-        command = builder_module().getBuildCommand(
+        command = module.getBuildCommand(
             debug_info,
             architecture,
             compiler,