relibc: bump submodule to c73e4227 (cfgetispeed/cfsetispeed Redox impl)
Bump the relibc submodule pointer to the Round 8 commit that implements cfgetispeed, cfgetospeed, cfsetispeed, cfsetospeed on the Redox target (previously all returned 0 or EINVAL unconditionally). The impl uses two new fields added to the Redox termios struct (__c_ispeed, __c_ospeed) for the stored speed values. Without this, serial tools (minicom, screen, cu) that query baud rate always saw 0 on Redox. The full canonical build (./local/scripts/build-redbear.sh redbear-mini) requires a prefix rebuild to regenerate the prefix's libc.a; this is what 'touch relibc && make prefix' does in the Redox build system.
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Submodule local/sources/relibc updated: 0fee9dc19f...c73e4227bc
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