If search.h is present but not tdestroy: implement it based on others t* functions
If search.h and tdestroy are not present: implement every t* functions.

Close must also be serialized (one single global lock/wait).

function call didn't match function prototype.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This sets the base level of the scope display back to the centre of
its channel. Has been broken for at least +1 year.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

This reverts commit 653a6637.

Conflicts:

	src/win32/thread.c

Those variable types were identical to VLC_VAR_STRING in practice
(Note: do not confuse variable types with configuration item types).

VLC maintains no history, so no wonder...

Parental advisory: naked kludge and explicit hack

We have reliable error detection with XCB, so this option has become
mostly useless. For testing/debugging, the developer can hack the
CheckSHM() function to return false if really needed.

This made no sense. If the thread is detached, the handle is released
asynchronously when the thread exits. So it cannot be used in any way
(except from the thread itself).