search for: ac_type_long_double_wid

..., it's my understanding that instead of having it return RETSIGTYPE and having autoconf determine the type, it can just be void and remove the check. The defined token seems to only occur in rsync.c and main.c. The second item is AC_C_LONG_DOUBLE which is replaced by AC_TYPE_LONG_DOUBLE and/or AC_TYPE_LONG_DOUBLE_WIDER. By their assessment, currently available compilers do indeed have long double types without needing to check for them. What may need checked is whether that long double type is wider than a double using AC_TYPE_LONG_DOUBLE_WIDER. The libs/snprintf.c file is the only one affected by the header de...