Update SourcePawn (#1518)
This fixes a number of parsing issues and compiler crashes, deprecates enum multipliers, fixes relative include paths on Windows, adds a `static_assert` statement for compile-time checks, and introduces new Linux profiling support. The relative include paths change will probably break some non-portable projects that relied on the old broken behaviour, but the fix is straightforward. The `#include` directive is now always relative to the file where it is used, whereas on Windows it was previously relative to the initial input file passed to the compiler if `/` was used instead of `\` in include paths.
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