Makefile cleanup: remove workaround for 11yo boost problem

There's a tradition that doesn't want to die. A long time ago someone added a work around for boost 1.40 problem. The referenced boost ticket was closed 11 years ago.

# Some versions of GCC warn about some versions of Boost regarding
# missing initializer for members in its posix_time.
# https://svn.boost.org/trac/boost/ticket/3477
# But older GCC compilers don't have the flag.
AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)

Bugs are not whisky... 11yo is bad.

It seems this was cleaned up in the core code, but not in premium.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information