fix threads-disabling features that were accidentally checked in with

the previous change

configure.in

@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(AC_DIVERSION_NOTICE)dnl
 esyscmd([sed "s/^/# /" COPYRIGHT])dnl
 AC_DIVERT_POP()dnl
 
-AC_REVISION($Revision: 1.180 $)
+AC_REVISION($Revision: 1.181 $)
 
 AC_INIT(lib/dns/name.c)
 AC_PREREQ(2.13)
@@ -135,9 +135,11 @@ AC_ARG_ENABLE(threads,
 case "$enable_threads" in
 	yes|'')
 		AC_MSG_RESULT(yes)
+		use_threads=true
 		ISC_PLATFORM_USETHREADS="#define ISC_PLATFORM_USETHREADS 1" ;;
 	no)
 		AC_MSG_RESULT(no)	
+		use_threads=false
 		ISC_PLATFORM_USETHREADS="#undef ISC_PLATFORM_USETHREADS" ;;
 	*)
 	    	AC_MSG_ERROR(["--enable-threads takes yes or no"]) ;;
@@ -322,7 +324,7 @@ AC_C_INLINE
 AC_TYPE_SIZE_T
 AC_HEADER_TIME
 
-if "$enable_threads" = "yes"
+if $use_threads
 then
 #
 # Search for / configure pthreads in a system-dependent fashion.