compat / cygwin.hon commit Merge branch 'ag/rebase-i-in-c' into js/rebase-in-c-5.5-work-with-rebase-i-in-c (5ab7e0f)
   1int cygwin_offset_1st_component(const char *path);
   2#define offset_1st_component cygwin_offset_1st_component