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.