Fix sanitizer search paths.

afaict this directory hasn't been named lib64 for quite some time, and
it definitely isn't for the NDK this sample uses on macOS. `find
prebuilts/clang/host -name lib64` only finds one version of Clang where
this was named lib64 (there were likely others that have since been
removed from the repos, but they'll be rather old).

This wasn't caught by CI because the shell script that drives the build
only builds the default build type. That will be fixed automatically as
part of #1010.

sanitizers/app/src/main/cpp/CMakeLists.txt

@@ -51,7 +51,7 @@ if(SANITIZE)
         target_link_options(sanitizers PUBLIC -fsanitize=address)
 
         # Grab libclang_rt.asan-${ARCH_STR}-android.so from the NDK.
-        file(GLOB ASAN_GLOB "${HINT_PATH}/../lib64/clang/*/lib/linux")
+        file(GLOB ASAN_GLOB "${HINT_PATH}/../lib/clang/*/lib/linux")
         find_file(ASAN
                 NAMES libclang_rt.asan-${ARCH_STR}-android.so
                 PATHS ${ASAN_GLOB})
@@ -76,7 +76,7 @@ if(SANITIZE)
         target_link_options(sanitizers PUBLIC -fsanitize=undefined -fno-sanitize-recover=undefined)
 
         # Grab libclang_rt.ubsan_standalone-${ARCH_STR}-android.so from the NDK.
-        file(GLOB UBSAN_GLOB "${HINT_PATH}/../lib64/clang/*/lib/linux")
+        file(GLOB UBSAN_GLOB "${HINT_PATH}/../lib/clang/*/lib/linux")
         find_file(UBSAN
                 NAMES libclang_rt.ubsan_standalone-${ARCH_STR}-android.so
                 PATHS ${UBSAN_GLOB})