getdeps: add thrift built-in includes to THRIFT_INCLUDE_PATH

Summary:
X-link: facebookincubator/zstrong#709

The thrift compiler includes some additional thrift files for built-in features, e.g. annotations.  Unlike other thrift libraries, these thrift files are installed directly to `include` instead of `include/thrift-files`.

If we detect `include/thrift`, then consider that to be an indication that we should add `include` to the `THRIFT_INCLUDE_PATH`, so that these can be picked up by things that depend on the built-in thrift files.

Reviewed By: mitrandir77

Differential Revision:
D53943880

Privacy Context Container: L1122763

fbshipit-source-id: d30c3e2598ca8904c1b054965aca2057733ecd20

build/fbcode_builder/getdeps/buildopts.py

@@ -368,6 +368,11 @@ def add_prefix_to_env(
             elif "/bz2-" in d:
                 add_flag(env, "CPPFLAGS", f"-I{includedir}", append=append)
 
+            # The thrift compiler's built-in includes are installed directly to the include dir
+            includethriftdir = os.path.join(d, "include", "thrift")
+            if os.path.exists(includethriftdir):
+                add_path_entry(env, "THRIFT_INCLUDE_PATH", includedir, append=append)
+
         # Map from FB python manifests to PYTHONPATH
         pydir = os.path.join(d, "lib", "fb-py-libs")
         if os.path.exists(pydir):