Updating the build instructions.

Change-Id: I8e8ed1507d98c8522bae182831888ae4ceda83f3
diff --git a/INSTALL b/INSTALL
index 95b64e1..989b714 100644
--- a/INSTALL
+++ b/INSTALL
@@ -77,7 +77,7 @@
   1/ First, build Android's patched libSDL as a static library,
      this can be done as:
 
-        cd $TOP/extlibs/libsdl-1.2.12
+        cd $TOP/external/qemu/distrib/sdl-1.2.12
         ./android-configure --prefix=<PATH>
         make
         make install
@@ -89,8 +89,8 @@
 
   2/ Configure the emulator with android-configure.sh, as in:
 
-        cd $TOP/tools/qemu
-        ./android-configure.sh --sdl-config=<PATH>
+        cd $TOP/external/qemu
+        ./android-configure.sh --sdl-config=<PATH>/bin/sdl-config
         make
 
      Where <PATH> is the same path you used with the --prefix option