Adjust installation location to /usr

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: b/src/luaconf.h
===================================================================
--- a/src/luaconf.h
+++ b/src/luaconf.h
@@ -26,9 +26,9 @@
 ** Note to distribution maintainers: do NOT patch the following line!
 ** Please read ../doc/install.html#distro and pass PREFIX=/usr instead.
 */
-#define LUA_ROOT	"/usr/local/"
-#define LUA_LDIR	LUA_ROOT "share/lua/5.1/"
-#define LUA_CDIR	LUA_ROOT "lib/lua/5.1/"
+#define LUA_ROOT	"/usr/"
+#define LUA_LDIR	LUA_ROOT "share/lua/"
+#define LUA_CDIR	LUA_ROOT "lib/lua/"
 #ifdef LUA_XROOT
 #define LUA_JDIR	LUA_XROOT "share/luajit-2.0.0/"
 #define LUA_XPATH \