configure.ac: Don't let pthread check depend on OS

Don't check the operating system environment to detect the correct
linker flags for using the POSIX thread library.

configure.ac

@@ -161,6 +161,12 @@ AC_CHECK_LIB(socket,socket,SOCKETLIBS="$SOCKETLIBS -lsocket")
 AC_CHECK_LIB(resolv,main,SOCKETLIBS="$SOCKETLIBS -lresolv")
 AC_SUBST(SOCKETLIBS)
 
+dnl Check for POSIX thread libraries
+AC_CHECK_HEADERS(pthread.h)
+AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread",
+             AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread -lrt",-lrt))
+AC_SUBST(THRLIBS)
+
 dnl
 dnl check for math-related functions needing -lm
 AC_CHECK_HEADERS(math.h)
@@ -560,18 +566,6 @@ else
 	with_gnutls="no"
 fi
 
-dnl Check for POSIX thread libraries
-AC_CHECK_HEADERS(pthread.h)
-case $host in
-	*sun* | *solaris*)
-		AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread -lrt")
-	;;
-	*)
-		AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread")
-	;;
-esac
-AC_SUBST(THRLIBS)
-
 dnl
 dnl Checks for header files.
 dnl