nolibc updates for v6.4

o     Add support for loongarch.

o     Fix stack-protector issues.

o     Support additional integral types and signal-related macros.

o     Add support for stdin, stdout, and stderr.

o     Add getuid() and geteuid().

o     Allow S_I* macros to be overridden by program.

o     Defer to linux/fcntl.h and linux/stat.h to avoid duplicate
	definitions.

o     Many improvements to the self tests.
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