MIPS specific linux constants

- core.sys.posix.fcntl
- core.sys.posix.signal
- core.sys.posix.sys.mman
- core.sys.posix.sys.socket
port back GDC's __jmp_buf for ARM/PPC/PPC64

- I rechecked glibc's definitions
__jmp_buf for setjmp
ucontext_t
stat_t
Revert "Merge pull request #208 from alexrp/remove-threadasm"

This reverts commit f66067edc21777106e39f16e30eae3b28cc4b156, reversing
changes made to c97b1e9074321f3aa9ea42cd7e91711ac6055e46.
fix noexecstack assembler flag

- "clang -cc1as" only accepts the double dashed version
merge GDC changes to threadasm.S
fiber_switchContext for MIPS_O32
add threadasm.S to win64.mak MANIFEST
Win32/Win64 compatibility
Unify AA value alignment to size_t.sizeof (fixes bug 8583)

Sets the alignment of values in both AA declarations (object and aaA)
to size_t.sizeof bytes, which fixes byValue range iteration on x64.
version(Win64)
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Merge pull request #385 from dnewbie/master

Win32/Win64 compatibility
Add unit tests for bug 8583; restore 16-byte aligment on x64

This adds unit tests for the alignment fix to Slot, ensuring the two
declarations of an AA slot stay in sync. The 16-byte alignment rule for
x64 has been restored.
Merge pull request #386 from pearfalse/master

Explicitly set AA value alignment in slot to size_t.sizeof bytes (fixes bug 8583)
Merge pull request #364 from dawgfoto/MIPS

MIPS port