Revert "build: Use Homebrew's sqlite package if it is available"

This reverts ee7b84e from #20527.
This change was made without any rationale, maybe other than a brew
installed version might be newer, and that's "better". However when
building from source on macOS, it just results in drastically worse
perofrmance, and results in issues / confusions like #25724.

Resolves the "build from source" portion of #25724. Building from
depends is still not ideal, however I have some other changes that might
help improve things in that case.

The difference in performance can be observed using the example from
bitcoin/bitcoin#25724 (comment),
but minified to only 10 descriptors. i.e:
```bash
time src/bitcoin-cli createwallet speedy true
time src/bitcoin-cli importdescriptors '[
  {"desc":"raw(00145846369f3d6ba366d6f5a903fb5cf4dca3763c0e)#k9wh6v62","timestamp":"now"},
  {"desc":"raw(001420800aabf13f3a4c4ce3ce4c66cecf1d17f21a6e)#6m0hlfh4","timestamp":"now"},
  {"desc":"raw(0014c6bf9715e06d73ebf9b3b02d5cc48d24d8bbabc1)#wyavh36r","timestamp":"now"},
  {"desc":"raw(00141ba7807b3f46af113beaea5c698428ce7138cd8a)#jctdsups","timestamp":"now"},
  {"desc":"raw(00140c1bd27f10fff01b36ddf3c1febaa1acff19b080)#9s6nc3pk","timestamp":"now"},
  {"desc":"raw(00141226e31987e4bc2e63c0ee12908f675e40464b20)#9pp7qm39","timestamp":"now"},
  {"desc":"raw(0014f73f149f7503960a5e849c6ee7a8a8c336f631cb)#qtkxv9fc","timestamp":"now"},
  {"desc":"raw(0014c8ccb4d81ffc769fc5fdd8d7eed69b0e0cae5749)#hn39qayv","timestamp":"now"},
  {"desc":"raw(001498565aead2d67a22a6021d55210f2a917fc22169)#6ar3vwsx","timestamp":"now"},
  {"desc":"raw(001403013248ac0cd9eabe176cad162cda2a19f771e1)#4m47mukd","timestamp":"now"}
]'
```

Running master, when building from souce and using brew installed
sqlite, this takes ~3.4s. With this PR, the same operation takes ~0.3s.

Author: fanquake

configure.ac

@@ -753,10 +753,6 @@ case $host in
            BDB_LIBS="-L$bdb_prefix/lib -ldb_cxx-4.8"
          fi
 
-         if test "$use_sqlite" != "no" && $BREW list --versions sqlite3 >/dev/null; then
-           export PKG_CONFIG_PATH="$($BREW --prefix sqlite3 2>/dev/null)/lib/pkgconfig:$PKG_CONFIG_PATH"
-         fi
-
          if $BREW list --versions qt@5 >/dev/null; then
            export PKG_CONFIG_PATH="$($BREW --prefix qt@5 2>/dev/null)/lib/pkgconfig:$PKG_CONFIG_PATH"
          fi