legacy: Extract osi_compat from osi lib

These are too platform specific or may be handled
by other libraries

pid_t gettid(void) throw();
size_t strlcpy(char* dst, const char* src, size_t siz);
size_t strlcat(char* dst, const char* src, size_t siz);

Bug: 193830619
Tag: #refactor
Test: gd/cert/run

Change-Id: Ia41b07f81cffb1c055dee70fba0d71f950397b8e