lchmod: Port to Android API level 36. * m4/lchmod.m4 (gl_FUNC_LCHMOD): Use gl_CHECK_FUNCS_ANDROID to check for lchmod instead of AC_CHECK_FUNCS_ONCE. * m4/lchown.m4 (gl_FUNC_LCHOWN): Likewise. * doc/glibc-functions/lchmod.texi (lchmod): Document that the function is missing on Android API 35 and lower.