Build rk_closefrom even if including in libc

cf/roken-frag.m4

@@ -398,6 +398,8 @@ AC_BROKEN([					\
 	writev					\
 ])
 
+rk_LIBOBJ(closefrom)
+
 AM_CONDITIONAL(have_fnmatch_h,
 	test "$ac_cv_header_fnmatch_h" = yes -a "$ac_cv_func_fnmatch" = yes)
 

lib/roken/closefrom.c

@@ -43,7 +43,7 @@
 #include "roken.h"
 
 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
-closefrom(int fd)
+rk_closefrom(int fd)
 {
     int num = getdtablesize();
 

lib/roken/roken.h.in

@@ -1236,9 +1236,9 @@ vis(char *, int, int, int);
 
 #if !defined(HAVE_CLOSEFROM)
 #define closefrom rk_closefrom
-ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
-closefrom(int);
 #endif
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+rk_closefrom(int);
 
 #if !defined(HAVE_TIMEGM)
 #define timegm rk_timegm