Fix FTBFS from commit 2c188798.

On Linux, utmp.h is necessary even if utmpx.h is present.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

ktalkd/ktalkd/includ.h

@@ -60,6 +60,9 @@
 #elif defined HAVE_UTMP_H
 #include <utmp.h>
 #endif
+#if defined(UTMP_AND_PROC_FIND_USER) and defined(HAVE_UTMP_H)
+#include <utmp.h>
+#endif
 #ifndef UT_LINESIZE
 #define UT_LINESIZE 12
 #endif