Include stdio.h for vsnprintf in buffer.h #693
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`vsnprintf` is defined in `stdio.h`: https://github.com/bminor/glibc/blob/734e7f91e752f44984fe42c2384c23a0290b6e56/libio/stdio.h#L389 All the examples include both `stdio.h` and `stdarg.h` when using `vsnprintf`. For whatever reason, on the emscripten target there is an error due to missing `vsnprintf` but on other targets there is no error.
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vsnprintfis defined instdio.h:https://github.com/bminor/glibc/blob/734e7f91e752f44984fe42c2384c23a0290b6e56/libio/stdio.h#L389
All the examples include both
stdio.handstdarg.hwhen usingvsnprintf. For whatever reason, on the emscripten target there is an error due to missingvsnprintfbut on other targets there is no error.