Do not try to dsymutil .a files, which is unsupported

Author: jckarter

utils/build-script-impl

@@ -3838,11 +3838,12 @@ for host in "${ALL_HOSTS[@]}"; do
 
             # Run dsymutil on executables and shared libraries.
             #
-            # Exclude shell scripts.
+            # Exclude shell scripts and static archives.
             (cd "${INSTALL_SYMROOT}" &&
              find ./"${CURRENT_PREFIX}" -perm -0111 -type f -print | \
                grep -v crashlog.py | \
                grep -v symbolication.py | \
+               grep -v '.a$' | \
                xargs -n 1 -P ${BUILD_JOBS} $(xcrun_find_tool dsymutil))
 
             # Strip executables, shared libraries and static libraries in