Fix previous commit:
Don't handle Solaris2-flag _POSIX_PTHREAD_SEMANTICS in configure at all
but simply #ifdef solaris2_TARGET_OS #define ... it in the header-file.
-# Solaris2 strikes again.
-unix_SRC_HSC2HS_OPTS += @unix_SRC_HSC2HS_OPTS@
-
#-----------------------------------------------------------------------------
# GMP Library (version 2.0.x or above)
#
#-----------------------------------------------------------------------------
# GMP Library (version 2.0.x or above)
#