add support for any string to cx_strstr() and cx_strstr_m()

use C11 _Thread_local keyword instead of macro

changes cx_strcpy() and cx_strcpy_a() to accept any string

annotate unreachable path (if the pre-condition is not violated)

(0) -1000 -300 -100 -30 -10 -4 +4 tip

mercurial