fix LDFLAGS

Author: remicollet

config.m4

@@ -12,7 +12,7 @@ if test "$PHP_XPASS" != "no"; then
   PHP_EVAL_LIBLINE([$LIBXCRYPT_LIBS], [XPASS_SHARED_LIBADD])
 
   old_CFLAGS=$CFLAGS; CFLAGS="$CFLAGS $LIBXCRYPT_CFLAGS"
-  old_LDFLAGS=$CFLAGS; LDFLAGS="$CFLAGS $LIBXCRYPT_LIBS"
+  old_LDFLAGS=$LDFLAGS; LDFLAGS="$LIBXCRYPT_LIBS $LDFLAGS"
 
   AC_MSG_CHECKING([for yescrypt])
   AC_RUN_IFELSE([AC_LANG_SOURCE([[