Remove extraneous #include.
Remove extraneous #include.

This include was causing build errors on a Linux system with the
following identity:

    Linux bleh 4.4.0-93-generic #116-Ubuntu SMP Fri Aug 11 21:17:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

The build errors were:

    In file included from repos/apache-mynewt-core/kernel/os/include/os/os.h:77:0,
                     from repos/apache-mynewt-core/net/nimble/transport/socket/src/ble_hci_socket.c:46:
    repos/apache-mynewt-core/kernel/os/include/os/endian.h:43:40: error: expected declaration specifiers or ‘...’ before ‘(’ token
     #define os_bswap_32(x)    ((uint32_t) ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24)))
                                            ^
    In file included from repos/apache-mynewt-core/kernel/os/include/os/os.h:77:0,
                     from repos/apache-mynewt-core/net/nimble/transport/socket/src/ble_hci_socket.c:46:
    repos/apache-mynewt-core/kernel/os/include/os/endian.h:48:6: error: expected declaration specifiers or ‘...’ before ‘(’ token
         ((((x) & 0xff00) >> 8) |                        \
          ^
    In file included from repos/apache-mynewt-core/kernel/os/include/os/os.h:77:0,
                     from repos/apache-mynewt-core/net/nimble/transport/socket/src/ble_hci_socket.c:46:
    repos/apache-mynewt-core/kernel/os/include/os/endian.h:43:40: error: expected declaration specifiers or ‘...’ before ‘(’ token
     #define os_bswap_32(x)    ((uint32_t) ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24)))
                                            ^
    In file included from repos/apache-mynewt-core/kernel/os/include/os/os.h:77:0,
                     from repos/apache-mynewt-core/net/nimble/transport/socket/src/ble_hci_socket.c:46:
    repos/apache-mynewt-core/kernel/os/include/os/endian.h:48:6: error: expected declaration specifiers or ‘...’ before ‘(’ token
         ((((x) & 0xff00) >> 8) |                        \

The problem was caused by Mynewt's hton/ntoh macros interfering with the
system's functions with the same name declared in `netinet/in.h`.

`os.h` gets included later in this file anyway (after the inclusion of
`netinet/in.h`), so removing this include does not cause any problems.

X-Original-Commit: e47ad6536bc7f72b00359f196f82c6927ea62bcc

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble