Update qt build script to set nvidia or native configs from commandline

Builds/QtCreator/build_all.sh

@@ -1,14 +1,35 @@
 #!/bin/bash
 
+REBUILD=''
+NVIDIA=''
+NATIVE=''
+
+while test $# -gt 0
+do
+    case "$1" in
+        --rebuild) REBUILD='1'
+            ;;
+        --nvidia) NVIDIA="CONFIG += nvidia"
+            ;;
+        --native) NATIVE="CONFIG += native"
+            ;;
+        --*) echo "bad option $1"; exit 1
+            ;;
+        *) echo "unrecognised argument $1"; exit 1
+            ;;
+    esac
+    shift
+done
+
 DIR=$( cd "$(dirname "${BASH_SOURCE[0]}" )" && pwd )
 
 for PROJ in ${DIR}/{Ember,EmberCL,EmberGenome,EmberRender,EmberAnimate,Fractorium}
 do
   pushd $PROJ
-  if [ "x--rebuild" = "x$1" ]; then
+  if [ "x1" = "x$REBUILD" ]; then
     make clean
   fi
-  qmake
+  qmake "$NVIDIA" "$NATIVE"
   make -j9
   if [ "x$?" != "x0" ]; then
     echo "Build failed! Check output for errors."