Now that the macro are either imported from the system or defined by
configure. don't define them in every source file.

All the initialisation functions returning a new object instance that
was allocated through malloc() or calloc() can get the malloc
attribute so that the compiler can optimise their call.

Instead of using a 1KB buffer to copy over the Content-Type header
value to compare it, get a (pointer, length) pair and use that for
comparison.

This should also allow the compiler to inline the
decode_anxdata_header() function.

--HG--
extra : transplant_source : W%EE%5CN%BD%B8%8C%FA%CD%15p%CD%A5%CBQ%1E%893%97S

In update_chapter_display() the t_title array, declared on the buffer,
is used after it has disappeared from the scope. Instead of doing
that, use directly the xine_ui_data_t array.

Declare xine_event_t and xine_ui_data_t with their values directly,
makes it more explicit that everything disappears at the end of the
function.

--HG--
extra : transplant_source : %25T%10eEd%CF%ECS%AC%A3%E3%E0%D3J%F6%A5%15%9EE

Use the proper function for common memory operations (memset() for
zeroing, memcpy() for copying, memmove() for moving), instead of
looping through arrays.

By extension, remove loops to reset arrays when they were allocated
with calloc() and thus already zeroed.

Also don't reset memory after it's allocated if we do that with
calloc.