This reverts commit dcebfb11.

This reverts commit b5554bcc.

netdev_tap.c uses AF_LINK when compiled on OSX native.

Preparation to remove NATIVEINCLUDES.

In another header file, `socklen_t` is defined to `__darwin_socklen_t` which is
an `uint32_t` and it conflicts.

Preparation to remove NATIVEINCLUDES.

        pkg, nordic_softdevice_ble: disable CFLAGS to omit compiler error
        sys, pm_layered: fix casting nonscalar to the same type
        cpu, stm32_common: fix type-limits, remove always true assert
        cpu, stm32f4: fix pointer arithmetic in periph/i2c
        drivers, at86rf2xx: fix type-limits where condition always true
        saul, gpio: fix if no gpio configured for saul
        cpu, saml21: add frequency check to periph/timer
        driver, cc110x: fix unused param and type-limts errors
        boards, wsn430-common: fix old-style-declaration
        make: fix old style definition
        drivers, sdcard_spi: fix old style typedef
        driver, at30tse: remove unnecessary check
        driver, nrf24: fix type-limit
        driver, pn532: change buffer from char to uint8_t
        tests/driver_sdcard: fix type limits
        boards, feather-m0: add missing field inits
        driver, tcs37727: fix type limits
        pkg, emb6: disable some compiler warnings
        tests/emb6: disable some compiler warings
        pkg, openthread: fix sign compare and unused params
        tests/trickle: fix struct init
        tests/pthread_cooperation: fix type limits
        board, mips-malta: remove feature periph_uart
        shell: fix var size for netif command
        gnrc, netif: fix sign-compare
        gnrc, nib: fix sign-compare
        shell: fix output in netif command
        posix: fix type-limits in pthread_cond

Causes compilation error on Clang

Fixes #637.

This only provides a subset of vfs while being incompatible with it.
Since POSIX sockets don't use this module anymore it can be removed.

Extened the temporary workaround for mips boards to all mips boards
until pr#6639 is merged.

AwaLWM2M needs to be polled regularly to check for incoming data.
Since RIOT only supports timeout at the GNRC sock layer while
the network abstraction for RIOT in AwaLWM2M uses the posix layer,
this causes RIOT to be blocked waiting for data that never arrive.

This commit implements only the SO_RCVTIMEO option in setsockopt to
allow users to set a receive timeout for a socket at the posix layer.

Signed-off-by: Francois Berder <francois.berder@imgtec.com>

_bind_connect already sets errno and returns -1 or 0.

Signed-off-by: Francois Berder <francois.berder@imgtec.com>

Commit de41971a sets the default
timeout to 0. This change should not have been part of the commit.

Signed-off-by: Francois Berder <francois.berder@imgtec.com>

The address is an optional parameter of recvfrom. If it is
not null, recvfrom must store the address of the sender.
However this was only allowed if res was equal to 0, which
is wrong since res contains the number of bytes received
or -1.
This commit ensures that the address is set only if no
previous errors happened before.

Signed-off-by: Francois Berder <francois.berder@imgtec.com>

If an error happens, listen was returning 1 instead of -1.

Signed-off-by: Francois Berder <francois.berder@imgtec.com>