rpm builds improved and fixed

ax_init_standard_project.m4

@@ -225,6 +225,9 @@ AC_DEFUN([AX_INIT_STANDARD_PROJECT], [
   VENDOR=$((lsb_release -is 2>/dev/null || echo unknown) | tr ' ' '_')
   AX_SUBST(VENDOR)
   DISTRO=$(lsb_release -sc 2>/dev/null || uname -s 2>/dev/null)
+  if test "${DISTRO}" = "n/a"; then
+     DISTRO="${VENDOR}_$(lsb_release -sr 2>/dev/null | tr ' ' '_')"
+  fi
   AX_SUBST(DISTRO)
   ARCH=$((@<:@@<:@ $(uname -sm) =~ 64 @:>@@:>@ && echo amd64) || (@<:@@<:@ $(uname -sm) =~ 'i?86' @:>@@:>@ && echo i386 || uname -sm))
   AX_SUBST(ARCH)