common/config: make set_prog_path() accept one argument only

All callers of set_prog_path() pass it only one argument, the
program to find on the $PATH.  Therefore, to simplify things remove
the unused code which allowed fallback paths to be specified in the
remaining arguments.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

common/config

@@ -93,7 +93,7 @@ export LOCAL_CONFIGURE_OPTIONS=${LOCAL_CONFIGURE_OPTIONS:=--enable-readline=yes}
 
 export RECREATE_TEST_DEV=false
 
-# $1 = prog to look for, $2* = default pathnames if not found in $PATH
+# $1 = prog to look for
 set_prog_path()
 {
     p=`which $1 2> /dev/null`
@@ -101,17 +101,6 @@ set_prog_path()
         echo $p
         return 0
     fi
-    p=$1
-
-    shift
-    for f; do
-        if [ -x $f ]; then
-            echo $f
-            return 0
-        fi
-    done
-
-    echo ""
     return 1
 }