python-mediapipe: leave the semantic retriever out of libmediapipe.so

MediaPipe 1.1.0 links its SQLite memory and vector stores from prebuilt
archives built with Google's internal toolchain. They have no archive symbol
table, and once indexed they still need Google's libc++ (std::__u) and
internal symbols (__alloc_token_*__Znwm, sqlite_helpers, sqlite3_vector_init),
so the link of libmediapipe.so fails. Drop the semantic retriever's C API from
the library; mediapipe and its other tasks import and work as before.

pkgbuilds/python-mediapipe/0008-drop-semantic-retriever-from-libmediapipe.patch

@@ -0,0 +1,21 @@
+Drop the semantic retriever from libmediapipe.so
+
+MediaPipe 1.1.0 links its SQLite memory and vector stores from prebuilt
+archives (third_party/sqlite_prebuilt_files.bzl) built with Google's internal
+toolchain: they carry no archive symbol table, reference Google's libc++
+(std::__u) and internal symbols (__alloc_token_*__Znwm, sqlite_helpers,
+sqlite3_vector_init), and cannot link against a libstdc++ build. Leave the
+semantic retriever's C API out of the library; everything else, including
+the universal embedder, still builds. Only an explicit import of
+mediapipe.tasks.python.retrieval.semantic_retriever needs those symbols.
+
+--- a/mediapipe/tasks/c/BUILD
++++ b/mediapipe/tasks/c/BUILD
+@@ -45,7 +45,6 @@
+         "//mediapipe/tasks/c/audio/audio_embedder:audio_embedder_c_lib",
+         "//mediapipe/tasks/c/core:common",
+         "//mediapipe/tasks/c/metadata:flatbuffer_api_c_lib",
+-        "//mediapipe/tasks/c/retrieval/semantic_retriever:semantic_retriever_lib",
+         "//mediapipe/tasks/c/retrieval/universal_embedder:universal_embedder_lib",
+         "//mediapipe/tasks/c/text/language_detector:language_detector_c_lib",
+         "//mediapipe/tasks/c/text/text_classifier:text_classifier_c_lib",

pkgbuilds/python-mediapipe/PKGBUILD

@@ -43,8 +43,15 @@ source=("${_pkgname}-${pkgver}.tar.gz::https://github.com/google-ai-edge/mediapi
   "0005-set-hermetic-python-version-and-disable-odml-converter.patch"
   "0006-opencv5-geometry-header.patch"
   "0007-bump-rules-java.patch"
+  "0008-drop-semantic-retriever-from-libmediapipe.patch"
 )
-sha256sums=('ef260449409c942a35859ed017f13934f6bf6240ddccdd01a202225650dad73e' 'c97f02133adce63f0c28678ac1f21d65fa8255c80429b588aeeba8a1fac6202b' 'd18e88a217a00dc77cf2bfaa1d33b5fbc912deed5df686b0d2455fb0db75a677' '62cbd43346e7a7705127656a74bec44852e5bbfc006c4723005fdd23af5258db' 'fb082d88d9cca47534ae01fca676a3afdb909bfc82d52c97cf0eaedf34571d5f' 'bdead49ac5370dc84d9facee962bf2def5d9055d7339a37b2ba3f3b4bb02f811')
+sha256sums=('ef260449409c942a35859ed017f13934f6bf6240ddccdd01a202225650dad73e'
+            'c97f02133adce63f0c28678ac1f21d65fa8255c80429b588aeeba8a1fac6202b'
+            'd18e88a217a00dc77cf2bfaa1d33b5fbc912deed5df686b0d2455fb0db75a677'
+            '62cbd43346e7a7705127656a74bec44852e5bbfc006c4723005fdd23af5258db'
+            'fb082d88d9cca47534ae01fca676a3afdb909bfc82d52c97cf0eaedf34571d5f'
+            'bdead49ac5370dc84d9facee962bf2def5d9055d7339a37b2ba3f3b4bb02f811'
+            '2b7ce1adcbfb39379f396a917bbc805a571f207ac2569ec6161348d88b3ccaf2')
 
 
 prepare() {
@@ -58,6 +65,9 @@ prepare() {
   patch -p1 -i "${srcdir}/0005-set-hermetic-python-version-and-disable-odml-converter.patch"
   patch -p1 -i "${srcdir}/0006-opencv5-geometry-header.patch"
   patch -p1 -i "${srcdir}/0007-bump-rules-java.patch"
+  # 1.1.0's semantic retriever links Google-toolchain prebuilts (libc++,
+  # internal symbols) that cannot link here; leave it out of libmediapipe.so
+  patch -p1 -i "${srcdir}/0008-drop-semantic-retriever-from-libmediapipe.patch"
   # set __version__
   sed -i "s/__version__ = 'dev'/__version__ = '$pkgver'/" setup.py
   # set link_opencv to True