newapkbuild: detect CMakeLists.txt file for CMake

Some CMake packages do not have cmake/ directory, but all have
CMakeLists.txt present in the root directory.

newapkbuild.in

@@ -216,7 +216,7 @@ __EOF__
 			buildtype="perl"
 		elif [ -r "$sdir"/waf ]; then
 			buildtype="waf"
-		elif [ -d "$sdir"/cmake ]; then
+		elif [ -d "$sdir"/cmake ] || [ -r "$sdir/CMakeLists.txt" ]; then
 			buildtype="cmake"
 		elif [ -r "$sdir"/Makefile ]; then
 			buildtype="make"