[dunecontrol][CMake] Support quoting flags with single quotes during conversion.

bin/dunecontrol

@@ -573,7 +573,7 @@ run_default_configure () {
       # such that they are honored by cmake.
       flags="CXX CC CXXFLAGS CFLAGS CPPFLAGS LDFLAGS F77 FFLAGS FLIBS FC FCFLAGS FCLIBS LIBS"
       for i in  $flags; do
-        cflags=`echo $PARAMS | sed "s/.*\($i=\"[^\"]*\"\|$i=[^\s^ ]*\).*/\1/"`
+        cflags=`echo $PARAMS | sed "s/.*\($i=\"[^\"]*\"\|$i='[^']*'\|$i=[^\s^ ]*\).*/\1/"`
         if test "$cflags" != "$PARAMS"; then
             PREPARAMS="$PREPARAMS $cflags"
         fi