cleanup.
comment mingw toolset flags - #3967.
Merge branch 'develop'
Comment no more existing functions.
fix #10008.
Add variadic wait_for_all() and wait_for_any() functions
Merge pull request #10 from kylelutz/variadic-wait-for

Variadic wait functions
Merge branch 'develop' of github.com:boostorg/thread into develop
Fix typo.
Throw if malloc fails.
remove unused param warning.
remove dependency on MPL.
remove dependency on Optional.
Removed incomplete file.
Merge branch 'develop'
Silence warnings about unused variables.
make use of underlying_cast<int> when casting from an enum class.
Added README.md.
Added meta/libraries.json.
Merge pull request #12 from Lastique/patch-3

Silence warnings about unused variables.