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Avoid symbol conflict when static linking with a lib shipping own QOI

When several libraries linked statically into the project ship an
"implementation header" C library/functions, the linker may end up
with multiple symbols conflict, especially when the original sources
were tweaked.
With SFML, this happens e.g. when linking statically with the KTX
library or Basis Universal (which contains QOI actually).

Prepend our namespace prefix in front of the conflicting functions
using macros to resolve this.

(I'll submit a PR to the BasisU repo to be completely fair)

Signed-off-by: Alexander Lobakin <alobakin@mailbox.org>

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