patch #9553: Fix some issues in libc/
* libc/stdio/vfscanf.c (GETBYTE) [LPMx]: Early-clobber %0.
(GETBYTE) [default]: Use shorter instruction sequence.
* libc/stdio/vfprintf.c: Same.
(vfprintf): Fix build-warnings.
* libc/stdlib/dtostre.c (dtostre): Fix build warning.
* libc/stdlib/getenv.c (getenv): Fix build warning.
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