Resolve conflicts for functions introduced in Android API level 29. * lib/time.in.h (timespec_get): Consider REPLACE_TIMESPEC_GET. Disable _GL_CXXALIASWARN invocation on non-glibc systems. * m4/time_h.m4 (gl_TIME_H_DEFAULTS): Initialize REPLACE_TIMESPEC_GET. * modules/time (Makefile.am): Substitute REPLACE_TIMESPEC_GET. * m4/gettime.m4 (gl_CHECK_FUNC_TIMESPEC_GET): Set also gl_cv_onwards_func_timespec_get. * m4/timespec_get.m4 (gl_FUNC_TIMESPEC_GET): Conditionally set REPLACE_TIMESPEC_GET. * modules/timespec_get (Depends-on, configure.ac): Consider REPLACE_TIMESPEC_GET.