servertest/utiltest: Optionally test only 1 screen

It isn't necessary to test both screens when using sanitizers or
valgrind/helgrind.

server/servertest.in

@@ -34,10 +34,12 @@ NODL=
 FAKERUTARGS=
 DEPTH=24
 IPV6=1
+SCREENS="0 1"
 WRAP=
 XVFBARGS=
 VGLTRANS=1
 GLVND=0
+
 while [ $# -gt 0 ]; do
 	case "$1" in
 	-nodl)
@@ -61,6 +63,9 @@ while [ $# -gt 0 ]; do
 		DEPTH=30
 		FAKERUTARGS=-nostereo
 		;;
+	-onescreen)
+		SCREENS=0
+		;;
 	-wrap)
 		WRAP=$2; shift
 		;;
@@ -108,7 +113,7 @@ if [ "$FAKEOPENCL" = "1" -a ! "$EGLBACKEND" = "1" ]; then
 fi
 echo
 
-for SCREEN in 0 1; do
+for SCREEN in $SCREENS; do
 
 	export DISPLAY=:42.$SCREEN
 

util/utiltest.in

@@ -24,6 +24,7 @@ BIN=@CMAKE_RUNTIME_OUTPUT_DIRECTORY@
 SSL=@VGL_USESSL@
 DEPTHS="24 30"
 IPV6=1
+SCREENS="0 1"
 WRAP=
 
 while [ $# -gt 0 ]; do
@@ -34,6 +35,9 @@ while [ $# -gt 0 ]; do
 	-noipv6)
 		IPV6=0
 		;;
+	-onescreen)
+		SCREENS=0
+		;;
 	-wrap)
 		WRAP=$2; shift
 		;;
@@ -62,7 +66,7 @@ for depth in $DEPTHS; do
 	echo Xvfb started as process $PID
 	echo
 	sleep 2
-	for SCREEN in 0 1; do
+	for SCREEN in $SCREENS; do
 		echo \*\*\*\*\* Testing 1920x1200x$depth, Screen $SCREEN \*\*\*\*\*
 		DISPLAY=:42.$SCREEN $WRAP $BIN/fbxtest $NOSHM -time 0.2
 		DISPLAY=:42.$SCREEN $WRAP $BIN/fbxtest $NOSHM -time 0.2 -mt
@@ -79,7 +83,7 @@ for depth in $DEPTHS; do
 	echo Xvfb started as process $PID
 	echo
 	sleep 2
-	for SCREEN in 0 1; do
+	for SCREEN in $SCREENS; do
 		echo \*\*\*\*\* Testing 1024x768x$depth, Screen $SCREEN \*\*\*\*\*
 		DISPLAY=:42.$SCREEN $WRAP $BIN/fbxtest $NOSHM -time 0.2
 		DISPLAY=:42.$SCREEN $WRAP $BIN/fbxtest $NOSHM -time 0.2 -mt