Revert "games-puzzle/ltris: Fix a warning"

This reverts commit 2eb052c813.

This is an informational message, and is not meant to be
shoved under the rug by manually doing what the eclass
is already doing (the motivation to add this to the eclass
was to not have to do this in ebuilds in the first place).

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-puzzle/ltris/ltris-1.0.19-r2.ebuild

@@ -26,7 +26,6 @@ PATCHES=( "${FILESDIR}"/${P}-gentoo.patch )
 
 src_prepare() {
 	default
-	mv configure.in configure.ac || die
 	AT_M4DIR=m4 eautoreconf
 	append-cflags -std=gnu89 # build with gcc5 (bug #570966)
 }