Merge #16086: contrib: use newer config.guess & config.sub in install_db4.sh

00fade007c contrib: use newer config.guess & config.sub in install_db4.sh (fanquake)

Pull request description:

  The `config.guess` and `config.sub` packaged with `db-4.8.30.NC.tar.gz` are fairly old (2009) and fail to identify some system types i.e `ppc64le`. Replace them with more modern versions before configuring `db4`.

  Fixes #16064.

ACKs for commit 00fade:
  jamesob:
    tACK 00fade007c
  dongcarl:
    utACK 00fade007c
  laanwj:
    Tested ACK 00fade007c

Tree-SHA512: 54f9f2b0fcf802e6a284214035fcb3833577aa5881beb293921b6036b71d0bcd0872f06d14ddc76a4f8c0eee7ba71461dcc99dc907e7ddb5ae403fc02b245538

contrib/install_db4.sh

@@ -70,6 +70,20 @@ CLANG_CXX11_PATCH_HASH='7a9a47b03fd5fb93a16ef42235fa9512db9b0829cfc3bdf90edd3ec1
 http_get "${CLANG_CXX11_PATCH_URL}" clang.patch "${CLANG_CXX11_PATCH_HASH}"
 patch -p2 < clang.patch
 
+# The packaged config.guess and config.sub are ancient (2009) and can cause build issues.
+# Replace them with modern versions.
+# See https://github.com/bitcoin/bitcoin/issues/16064
+CONFIG_GUESS_URL='https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=55eaf3e779455c4e5cc9f82efb5278be8f8f900b'
+CONFIG_GUESS_HASH='2d1ff7bca773d2ec3c6217118129220fa72d8adda67c7d2bf79994b3129232c1'
+CONFIG_SUB_URL='https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=55eaf3e779455c4e5cc9f82efb5278be8f8f900b'
+CONFIG_SUB_HASH='3a4befde9bcdf0fdb2763fc1bfa74e8696df94e1ad7aac8042d133c8ff1d2e32'
+
+rm -f "dist/config.guess"
+rm -f "dist/config.sub"
+
+http_get "${CONFIG_GUESS_URL}" dist/config.guess "${CONFIG_GUESS_HASH}"
+http_get "${CONFIG_SUB_URL}" dist/config.sub "${CONFIG_SUB_HASH}"
+
 cd build_unix/
 
 "${BDB_PREFIX}/${BDB_VERSION}/dist/configure" \