contrib/jenkins: make configure args diff friendly

Removing new lines in DISTCHECK_CONFIGURE_FLAGS again is needed, as it
otherwise fails with:
  enable-sanitize
  /bin/bash: line 1: enable-sanitize: command not found

Change-Id: I049af384eccdb6f8e5b305ca35de106eeaca3fa8
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 990e6f4..f896b86 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -85,7 +85,16 @@
 export LD_LIBRARY_PATH="$inst/lib"
 export PATH="$inst/bin:$PATH"
 
-CONFIG="--enable-sanitize --enable-werror --with-uhd --with-usrp1 --with-lms --with-ipc --with-mstrx $INSTR"
+CONFIG="
+	--enable-sanitize
+	--enable-werror
+	--with-ipc
+	--with-lms
+	--with-mstrx
+	--with-uhd
+	--with-usrp1
+	$INSTR
+"
 
 # Additional configure options and depends
 if [ "$WITH_MANUALS" = "1" ]; then
@@ -109,7 +118,7 @@
   || cat-testlogs.sh
 
 if arch | grep -v -q arm; then
-	DISTCHECK_CONFIGURE_FLAGS="$CONFIG" $MAKE $PARALLEL_MAKE distcheck \
+	DISTCHECK_CONFIGURE_FLAGS="$(echo $CONFIG | tr -d '\n')" $MAKE $PARALLEL_MAKE distcheck \
 	  || cat-testlogs.sh
 fi