8143558: evaluate if thr_sigsetmask can be removed from hotspot (solaris) codebase
Reviewed-by: dholmes
## generate these charsets into sun.nio.cs#Big5Big5_SolarisBig5_HKSCSEUC_CNEUC_KREUC_JPEUC_JP_LINUXEUC_JP_OpenEUC_TWGBKGB18030ISO_8859_11ISO_8859_3ISO_8859_6ISO_8859_8JohabPCKTIS_620JIS_X_0201JIS_X_0208JIS_X_0212JIS_X_0208_SolarisJIS_X_0212_Solaris