libphobos: Backport library and bindings fixes from mainline

libphobos: Backport library and bindings fixes from mainline

D Runtime changes:

	- Fix MIPS64 bindings for CRuntime_UClibc.

Phobos changes:

	- Fix std.path.expandTilde erroneously raising onOutOfMemory
	  after failed call to getpwnam_r().
	- Fix std.random unittest failures on ILP32 targets.
	- Use GENERIC_IO on CRuntime_UClibc port of std.stdio.

libphobos/ChangeLog:

	* libdruntime/core/stdc/fenv.d: Compile in MIPS uClibc bindings on
	MIPS_Any targets.
	* libdruntime/core/stdc/math.d: Likewise.
	* libdruntime/core/sys/posix/dlfcn.d: Likewise.
	* libdruntime/core/sys/posix/setjmp.d: Add MIPS64 definitions for
	CRuntime_UClibc.
	* libdruntime/core/sys/posix/sys/types.d: Likewise.
	* src/std/path.d (expandTilde): Handle more errno codes that could be
	left set by getpwnam_r.
	* src/std/random.d: Use D_LP64 in unittests.
	* src/std/stdio.d: Set CRuntime_UClibc as GENERIC_IO target.