Update install_db4.sh

contrib/install_db4.sh

@@ -6,7 +6,7 @@ export LC_ALL=C
 set -e
 
 if [ -z "${1}" ]; then
-  echo "Usage: ./install_db4.sh <base-dir> [<extra-bdb-configure-flag> ...]"
+  echo "Usage: $0 <base-dir> [<extra-bdb-configure-flag> ...]"
   echo
   echo "Must specify a single argument: the directory in which db4 will be built."
   echo "This is probably \`pwd\` if you're at the root of the pivx repository."
@@ -51,7 +51,7 @@ http_get() {
   if [ -f "${2}" ]; then
     echo "File ${2} already exists; not downloading again"
   elif check_exists curl; then
-    curl --insecure "${1}" -o "${2}"
+    curl --insecure --retry 5 "${1}" -o "${2}"
   else
     wget --no-check-certificate "${1}" -O "${2}"
   fi
@@ -70,6 +70,20 @@ CLANG_CXX11_PATCH_HASH='7a9a47b03fd5fb93a16ef42235fa9512db9b0829cfc3bdf90edd3ec1
 http_get "${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" \