[PATCH] Fixes compile failure if REENTRANT_SYSCALLS_PROVIDED and MISSING_SYSCALL_NAMES defined

[Markus Eisenmann]

Hi!

The attached patch will fix some compiler issues if the macros REENTRANT_SYSCALLS_PROVIDED and  MISSING_SYSCALL_NAMES ...

In case of stdio/fopen.c and stdio64/fopen64.c compiling with a newer compiler like GCC 14.2 will
abort with an error like "implicit declaration of ...", because the open() - as replacement of _open_r (see reent.h) -
isn't declared; I.e., including <fcntl.h> unconditionaly fixes this compile-issue.
Note: Older GCC's are more "relaxed" and - for example GCC 11.3 - does not warn about this implicit declaration ?!

Another similar issue was replacing _rename_r by rename() in stdio/rename.c whitch caused a "forever-
loop" or stack-overflow by recursion - depending on the optimization level.

Best regards from Austria,
Markus
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