msvc/icl: Use __declspec(deprecated)

Prior to this on msvc/icl there was no handling of deprecated functions
and the deprecated warning was disabled.

After enabling there are a number of warnings relating to the CRT and
the use of the non-secure versions of several functions.  Defining
_CRT_SECURE_NO_WARNINGS silences these warnings.

Signed-off-by: Martin Storsjö <martin@martin.st>
msvc/icl: Use __declspec(noinline)

Signed-off-by: Martin Storsjö <martin@martin.st>
h264: remove an unused static constant

Signed-off-by: Martin Storsjö <martin@martin.st>