net/local: connect: Fix warning with gcc-arm-none-eabi-5-2016q1. Using...

net/local: connect: Fix warning with gcc-arm-none-eabi-5-2016q1.  Using compiler from gcc-arm-none-eabi-5-2016q1 toolchain:

  gcc version 5.3.1 20160307 (release) [ARM/embedded-5-branch revision 234589] (GNU Tools for ARM Embedded Processors)

gives error:

  local/local_connect.c:188:7: error: '_local_semtake' is static but used in inline function 'local_stream_connect' which is not static [-Werror]

this is due to compiler enforcing ISO/IEC 9899:1999 6.7.4.3:  "An inline definition of a function with external linkage shall not contain a definition of a modifiable object with static storage duration, and shall not contain a reference to an identifier with internal linkage."

Fix by making inlined caller to have internal linkage as well.