onig_sys can't build for WASM target

[whiskeycola]

Please add support compining to wasm

   Compiling onig_sys v69.8.1
The following warnings were emitted during compilation:

warning: onig_sys@69.8.1: In file included from oniguruma/src/regexec.c:36:
warning: onig_sys@69.8.1: oniguruma/src/regint.h:110:10: fatal error: 'stdlib.h' file not found
warning: onig_sys@69.8.1:   110 | #include <stdlib.h>
warning: onig_sys@69.8.1:       |          ^~~~~~~~~~
warning: onig_sys@69.8.1: 1 error generated.

error: failed to run custom build command for `onig_sys v69.8.1`