Keep the vendored runtimes out of /usr/bin.

The vendored vhs-teletext tree is Python source, not executables, so it moves
to the data dir; the compiled-in lookup path follows it. The vendored
VhsDecodeAutoAudioAlign is a .NET application that upstream runs through mono,
which Gentoo does not ship, so it is not installed at all.

diff -ur a/src/audio-align/CMakeLists.txt b/src/audio-align/CMakeLists.txt
--- a/src/audio-align/CMakeLists.txt	2026-08-03 01:05:20.997767958 -0400
+++ b/src/audio-align/CMakeLists.txt	2026-08-03 01:05:21.012506208 -0400
@@ -26,7 +26,6 @@
 )
 
 install(TARGETS tbc-audio-align)
-install(DIRECTORY "${_audio_align_vendor_dir}/" DESTINATION ${CMAKE_INSTALL_BINDIR}/vendor/vhs_decode_auto_audio_align)
 
 if(BUILD_TESTING)
     add_executable(test-audio-align-runtime
diff -ur a/src/ld-process-vbi/CMakeLists.txt b/src/ld-process-vbi/CMakeLists.txt
--- a/src/ld-process-vbi/CMakeLists.txt	2026-08-03 01:05:20.994944680 -0400
+++ b/src/ld-process-vbi/CMakeLists.txt	2026-08-03 01:05:21.012403987 -0400
@@ -14,7 +14,7 @@
 target_link_libraries(ld-process-vbi PRIVATE Qt::Core lddecode-library)
 set(_teletext_vendor_dir "${CMAKE_CURRENT_SOURCE_DIR}/vendor/vhs-teletext")
 target_compile_definitions(ld-process-vbi PRIVATE
-    TELETEXT_VENDOR_DIR="${_teletext_vendor_dir}"
+    TELETEXT_VENDOR_DIR="${CMAKE_INSTALL_FULL_DATADIR}/tbc-tools/vendor/vhs-teletext"
 )
 
 add_custom_command(TARGET ld-process-vbi POST_BUILD
@@ -25,7 +25,7 @@
 )
 
 install(TARGETS ld-process-vbi)
-install(DIRECTORY "${_teletext_vendor_dir}/" DESTINATION ${CMAKE_INSTALL_BINDIR}/vendor/vhs-teletext)
+install(DIRECTORY "${_teletext_vendor_dir}/" DESTINATION ${CMAKE_INSTALL_DATADIR}/tbc-tools/vendor/vhs-teletext)
 
 if(BUILD_TESTING)
     add_test(