Add "auto" to interpolation settings. Time a few soxr_oneshots to get a figure for...

diff --cc common.c
index 5fae31af404bc7fc25a3fe815ea63a334f748795,98ebe36c9b738087de42845897f1d0c050adb2dd..4bc54c073fd727d2f91cb7e454b56ceff5764fb1
--- 1/common.c
--- 2/common.c
+++ b/common.c
@@@ -1282,11 -1284,17 +1282,12 @@@ char *get_version_string() 
    char *version_string = malloc(1024);
    if (version_string) {
      strcpy(version_string, PACKAGE_VERSION);
 -#ifdef GITDESCRIPTION
 -    if (strlen(GITDESCRIPTION)) {
 -      strcat(version_string, "-");
 -      strcat(version_string, GITDESCRIPTION);
 -    }
 -#endif
++
  #ifdef CONFIG_LIBDAEMON
-     strcat(version_string, "-libdaemon");
+   strcat(version_string, "-libdaemon");
  #endif
  #ifdef CONFIG_MBEDTLS
-     strcat(version_string, "-mbedTLS");
+   strcat(version_string, "-mbedTLS");
  #endif
  #ifdef CONFIG_POLARSSL
      strcat(version_string, "-PolarSSL");