community/libthreadar: upgrade to 1.3.5

From 1.3.4 to 1.3.5

• removing const qualifier for private field in class semaphore which conflicted with assignment operator as reported by clang compiler

From 1.3.3 to 1.3.4

• removes const qualifier of field val in class barrier to keep the possibility of having a move assignment operator for that class (restriction seen under FreeBSD) -- https://sourceforge.net/p/libthreadar/code/ci/master/tree/build/ChangeLog