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Cherrypick gcc13 fix from upstream to compile on ubuntu 24.04 #5

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@mrcmry mrcmry commented Dec 27, 2024

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Compiling spike with gcc 13 (for example, included in Fedora 38
prerelease) fails with error:

    In file included from fesvr/syscall.h:6,
                     from fesvr/syscall.cc:4:
    fesvr/device.h:15:30: error: ‘uint64_t’ was not declared in this scope
       15 |   typedef std::function<void(uint64_t)> callback_t;
          |                              ^~~~~~~~

This is due to a gcc header dependency change. See for reference:
https://gcc.gnu.org/gcc-13/porting_to.html#header-dep-changes

This commit explicitly adds the missing <cstdint> header inclusion
to fix this build failure.

Signed-off-by: Julien Olivain <[email protected]>
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