nestopia and snes9x-next build scripts

These get built in a tmp directory under ios. Steps:

* Clone (or pull master) repo
* build core
* move core to modules directory

ios/script/cores/nestopia

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+cd tmp
+
+if [ -d "nestopia" ]
+then
+  echo "Updating Nestopia"
+  cd nestopia
+  git pull origin master
+else
+  git clone git@github.com:libretro/nestopia.git
+  cd nestopia
+fi
+
+cd libretro
+
+echo "Building Nestopia"
+make clean
+make -f Makefile platform=ios
+mv nestopia_libretro.dylib ../../../modules
+cd ../../../

ios/script/cores/snes9x_next

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+cd tmp
+
+if [ -d "snes9x-next" ]
+then
+  echo "Updating Snes9x-next"
+  cd snes9x-next
+  git pull origin master
+else
+  git clone git@github.com:libretro/snes9x-next.git
+  cd snes9x-next
+fi
+
+echo "Building Snes9x-next"
+make -f Makefile.libretro clean
+make -f Makefile.libretro platform=ios
+mv snes9x_next_libretro.dylib ../../modules
+cd ../../