Added Solaris definitions for various stdlib-defined functions
(cherry picked from commit 3fadb55bd52b5ae9eb9f4358272c653dea3642ff)
Added LC_ values for Solaris
(cherry picked from commit c2f0222aadf38591caf6f98c4dc1899fb286dd21)
Add support for manipulating thread priority on Solaris
(cherry picked from commit 5ed6e97238e8f4427d89a77268877b34be4b6af5)
Add ucontext_t support to Solaris
(cherry picked from commit 6681dee175b4fdfbf8e4f9d106a85bf9a6d78d17)
Add Solaris support for C fenv interfaces
(cherry picked from commit ae4fb728c4547de7102597d60ed6d3645d7d7fd2)

Conflicts:
	src/core/stdc/fenv.d
Added backtrace support for Solaris
(cherry picked from commit dcd51c8bffd6942b62a7a782e81a20b5e6420d40)

Conflicts:
	mak/MANIFEST
Added Solaris context functions
(cherry picked from commit 87914cfa15e1548afaf5cbe524151f2be0209688)