ci: Use CONFIG_SITE variable and --prefix option properly

This change fixes scripts when they are being run locally with a pre-
existed `$DEPENDS_DIR/$HOST` directory.

Author: hebasto

ci/test/06_script_a.sh

@@ -6,7 +6,10 @@
 
 export LC_ALL=C.UTF-8
 
-BITCOIN_CONFIG_ALL="--enable-suppress-external-warnings --disable-dependency-tracking --prefix=$DEPENDS_DIR/$HOST"
+BITCOIN_CONFIG_ALL="--enable-suppress-external-warnings --disable-dependency-tracking"
+if [ -z "$NO_DEPENDS" ]; then
+  BITCOIN_CONFIG_ALL="${BITCOIN_CONFIG_ALL} CONFIG_SITE=$DEPENDS_DIR/$HOST/share/config.site"
+fi
 if [ -z "$NO_WERROR" ]; then
   BITCOIN_CONFIG_ALL="${BITCOIN_CONFIG_ALL} --enable-werror"
 fi
@@ -23,7 +26,7 @@ if [ -n "$ANDROID_TOOLS_URL" ]; then
   exit 0
 fi
 
-BITCOIN_CONFIG_ALL="${BITCOIN_CONFIG_ALL} --enable-external-signer --bindir=$BASE_OUTDIR/bin --libdir=$BASE_OUTDIR/lib"
+BITCOIN_CONFIG_ALL="${BITCOIN_CONFIG_ALL} --enable-external-signer --prefix=$BASE_OUTDIR"
 
 if [ -n "$CONFIG_SHELL" ]; then
   CI_EXEC "$CONFIG_SHELL" -c "./autogen.sh"