Replace individual distro release file checks with

`--with-distro=unknown`

package/lxc/Makefile

@@ -29,26 +29,15 @@ include $(INCLUDE_DIR)/package.mk
 START_LXC = S64lxc
 
 CONFIGURE_ARGS += \
-	ac_cv_header_sys_types_h_makedev=no \
+    --with-distro=unknown \
-	ac_cv_file__etc_redhat_release=no \
+    ac_cv_header_sys_types_h_makedev=no \
-	ac_cv_file__etc_fedora_release=no \
+    --prefix= \
-	ac_cv_file__etc_centos_release=no \
+    --exec_prefix= \
-	ac_cv_file__etc_oracle_release=no \
+    --enable-doc=no \
-	ac_cv_file__etc_alpine_release=no \
+    --enable-api-docs=no \
-	ac_cv_file__etc_gentoo_release=no \
+    --enable-examples=no \
-	ac_cv_file__etc_pld_release=no \
+    --enable-bash=no \
-	ac_cv_file__etc_arch_release=no \
+    --enable-python=no
-	ac_cv_file__etc_suse_release=no \
-	ac_cv_file__etc_debian_version=no \
-	ac_cv_file__etc_lsb_release=no \
-	ac_cv_file__etc_altlinux_release=no \
-	--prefix= \
-	--exec_prefix= \
-	--enable-doc=no \
-	--enable-api-docs=no \
-	--enable-examples=no \
-	--enable-bash=no \
-	--enable-python=no
 
 define Package/lxc/description
 	LXC is the userspace control package for Linux Containers, a lightweight