core/net/uip.h: Add missing #include <string.h>

Fixes implicit definition of memcmp() warnings/errors.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
Sender rank in Hop-by-Hop option has inverted bytes
Setting uip_ext_len again breaks hop-by-hop option
Insert properly Hop-by-Hop option at first hop
Improve RPL hop-by-hop option detection
Merge pull request #650 from cetic/pr-rpl-hbh-fixes

Fix for RPL Hop-by-Hop options
rl78: Change RIMEADDR_CONF_SIZE to LINKADDR_CONF_SIZE because the rimeaddr module has been renamed to linkaddr.
Merge pull request #734 from hexluthor/rl78-linkaddr

rl78: Change RIMEADDR_CONF_SIZE to LINKADDR_CONF_SIZE
Merge pull request #711 from gebart/upstream-fix-implicit-definitions

uip.h missing #include <string.h>
Merges Z1SP into Z1 platform
Only wait for a keypress if the user is told to press a key.
Merge pull request #747 from oliverschmidt/master

Only wait for a keypress if the user is told to press a key.
Merge pull request #739 from alignan/merge_z1sp_with_z1

Merges Z1SP into Z1 platform
Clean up script commands in .travis.yml.

Besides general whitespace and quoting cleanup, commands that test
variables were changed from:
  [ $B = a ] && command || true
to
  if [ $B = a ] ; then command ; fi
This form correctly returns the exit code of "command".
Add retries to commands that download from external servers.

This helps reduce the chance of a build failure due to transient
download error.  This also switches to consistent use of wget
throughout, which reports download errors more cleanly in the travis
build logs.
Rename travis "arm" BUILD_ARCH to "arm-apcs".

These platforms are built with an old ARM compiler that supports the
deprecated APCS standard.
Increase fixed filename sizes in SLIP tunnels

Long serial port names like
  /dev/serial/by-id/usb-FTDI_FT230X_Basic_UART_DN0038W8-if00-port0
cause crashes.  This is the simplest fix to avoid the problem.
Merge pull request #748 from jimparis/travis-cleanup

Travis cleanup
Merge pull request #737 from jimparis/slip-buffer-overflow-fixes

Increase fixed filename sizes in SLIP tunnels