avcodec/x86/mlpdsp: Only use asm when non-local inline asm lables are supported

This is part of the patch-set for intel C inline asm on windows support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Automatically change MANGLE() into named inline asm operands when direct symbol reference in inline asm are not supported.

This is part of the patch-set for intel C inline asm on windows support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>