FcInitReinitialize - re-initialize library
#include <fontconfig/fontconfig.h>
FcBool FcInitReinitialize (void);
Forces the default configuration file to be reloaded and resets the default
  configuration. Returns FcFalse if the configuration cannot be reloaded (due to
  configuration file errors, allocation failures or other issues) and leaves the
  existing configuration unchanged. Otherwise returns FcTrue.