[dunecontrol][CMake] Translates --prefix to CMAKE_INSTALL_PREFIX.

lib/dunecommonam2cmake.lib

@@ -41,4 +41,10 @@ dune_common_options_am2cmake()
     if test "x$arg" != "x$PARAMS"; then
         CMAKE_PARAMS="$CMAKE_PARAMS -DMINIMAL_DEBUG_LEVEL:String=$arg"
     fi
+
+    #Check for --prefix
+    local arg=`echo $PARAMS| sed "s/.*--prefix=\(\S*\).*/\1/"`
+    if test "x$arg" != "x$PARAMS"; then
+        CMAKE_PARAMS="$CMAKE_PARAMS -DCMAKE_INSTALL_PREFIX=$arg"
+    fi
 }