musl: update to 1.1.16+ git HEAD 2017-08-30

musl: update to 1.1.16+ git HEAD 2017-08-30

Fixes critical issues for memset() & fflush()

Changes:

5f7efb8 move IPPORT_RESERVED from netdb.h to netinet/in.h
5f3b652 add powerpc64 and s390x to list of supported archs in INSTALL
file
9d4c902 fix undefined behavior in memset due to missing sequence points
c7f56b4 __init_libc: add fallbacks for __progname setup
cc08669 add SIOCGSTAMPNS socket ioctl macro to ioctl.h
02b50c9 fix mips ioctl macros to match linux asm/sockios.h
670d6d0 fix unsynchronized access to FILE structure in fflush(0)

Tested on cns3xxx & imx6

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>