27ca9bc4b0
Points the relibc submodule at 4e9fbf4c. sys/timerfd.h and sys/signalfd.h
declare their prototypes in the cbindgen trailer, which is emitted outside the
extern "C" block cpp_compat generates, so C++ consumers linked against a
mangled name while relibc exports the plain C symbol:
alignedtimer.cpp:(.text+0x29a): undefined reference to
`timerfd_create(int, int)'
(plasma-workspace libclock). C callers were unaffected, which is why it
survived until a C++ consumer appeared.
Also refreshes the tracked-source baseline. This should become largely static
now that cook stages tracked vendored sources out of tree.