libiberty: sync with gcc commit df3510f80e7c02d9

libiberty: sync with gcc commit df3510f80e7c02d9

Sync the libiberty/ directory with gcc commit
df3510f80e7c02d9c19d7cb33759cd925880f53a.  This pulls in the following
gcc commits and the associated updates to 'libiberty/ChangeLog':

  * 06fb00cb66d libiberty: Fix typos in various files
  * fbf903e5b9f Re-flow lines made longer than 80 characters by typo fixes
  * cfb945957ee Regenerate some autoconf configure scripts after recent spelling fixes.
  * bc4d9b6aeb3 libiberty: avoid exponential back reference issue in D demangler

I have retained the changes that are in the following binutils-gdb
commit, which are not in gcc:

  commit 219822fd5db6305592b45677a3b38c02b523360e
  Date:   Tue Apr 9 06:39:21 2024 -0700

    mmap: Avoid the sanitizer configure check failure