The aarch64 toolchain doesn't support them, and we were already implementing
most of the fake long-double functions differently anyway.
Change-Id: I4a2f2df81972ee9c34ddfe96cec81b126506d881
Also fix the signature of usleep, and the definition of useconds_t which
should be unsigned, as the 'u' in its name implies.
This patch also cleans up the existing FreeBSD hacks by moving the libm
stuff from <sys/cdefs.h> to a libm-private header, and adding comments
about the hacks we use to build FreeBSD source.
Change-Id: Ibe5067a380502df94a0a3a7901969b35411085b6