fix autogen not being in the build step

PKGBUILD

@@ -55,7 +55,9 @@ prepare(){
   # lua5.1 package is named lua51 on Arch
   # we could probably just make it compile against the current lua
   sed -i 's/lua5.1/lua51/' configure.ac
+}
 
+build() {
   ./autogen.sh
 
   # Hud causes segfault in gtk version. Wifi doesn't really work.
@@ -65,9 +67,7 @@ prepare(){
     --enable-glx \
     --enable-openal \
     --enable-glade
-}
 
-build() {
   cd "${srcdir}/${_pkgname}/${_builddir}"
 
   make