g-soccon-darwin.ads, [...]: Add new constant Thread_Blocking_IO...

g-soccon-darwin.ads, [...]: Add new constant Thread_Blocking_IO...

2007-04-20  Thomas Quinot  <quinot@adacore.com>

	* g-soccon-darwin.ads, gen-soccon.c: Add new constant
	Thread_Blocking_IO, always True by default, set False on a per-runtime
	basis.
	Add Windows-specific constants
	Add new constant Need_Netdb_Buffer.
	Add new macros to indicate whether getXXXbyYYY is thread safe and, if
	not, whether to use getXXXbyYYY_r.

	* gsocket.h: Add new constant Need_Netdb_Buffer.
	Add new macros to indicate whether getXXXbyYYY is thread safe and, if
	not, whether to use getXXXbyYYY_r.

From-SVN: r125466