Use LZMA_VERSION_STRING instead of PACKAGE_VERSION.

Those are the same thing, and the former makes it a bit
easier to build the code with other build systems, because
one doesn't need to update the version number into custom
config.h.

This change affects only lzmainfo. Other tools were already
using LZMA_VERSION_STRING.

src/lzmainfo/lzmainfo.c

@@ -43,7 +43,7 @@ _("Usage: %s [--help] [--version] [FILE]...\n"
 static void lzma_attribute((noreturn))
 version(void)
 {
-	puts("lzmainfo (" PACKAGE_NAME ") " PACKAGE_VERSION);
+	puts("lzmainfo (" PACKAGE_NAME ") " LZMA_VERSION_STRING);
 	tuklib_exit(EXIT_SUCCESS, EXIT_FAILURE, true);
 }