uclibc: enable UCLIBC_HAS_UTMP in snapshot configuration

Otherwise busybox in the default configuration fails to build.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/uclibc/uClibc-snapshot.config

@@ -237,6 +237,7 @@ UCLIBC_HAS_FTW=y
 # UCLIBC_HAS_FTS is not set
 UCLIBC_HAS_GLOB=y
 UCLIBC_HAS_GNU_GLOB=y
+UCLIBC_HAS_UTMP=y
 UCLIBC_HAS_UTMPX=y
 
 #