util-linux: fix build with uclibc

Fix build of scriptreplay with uClibc.
Some parts of the libm detection were backported to 2.29.2, but some
parts were missing, which are added here. This patch is needed when
libm is a separate library, this is not needed for LEDE master, because
libm is there integrated in the libc for uClibc and musl.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>

package/utils/util-linux/patches/001-uclibc_add_libm_to_scriptreplay.patch

@@ -0,0 +1,24 @@
+From feda4342df1ced25df3d200ed23469e740196c86 Mon Sep 17 00:00:00 2001
+From: Karel Zak <kzak@redhat.com>
+Date: Wed, 18 Jan 2017 13:17:21 +0100
+Subject: build-sys: use -lm for scriptreplay if necessary
+
+Reported-by: Bert van Hall <bert.vanhall@avionic-design.de>
+Addresses: https://github.com/karelzak/util-linux/pull/397
+Signed-off-by: Karel Zak <kzak@redhat.com>
+---
+ configure.ac             | 7 +++++++
+ term-utils/Makemodule.am | 2 +-
+ 2 files changed, 8 insertions(+), 1 deletion(-)
+
+--- a/term-utils/Makemodule.am
++++ b/term-utils/Makemodule.am
+@@ -21,7 +21,7 @@ if BUILD_SCRIPTREPLAY
+ usrbin_exec_PROGRAMS += scriptreplay
+ dist_man_MANS += term-utils/scriptreplay.1
+ scriptreplay_SOURCES = term-utils/scriptreplay.c
+-scriptreplay_LDADD = $(LDADD) libcommon.la
++scriptreplay_LDADD = $(LDADD) libcommon.la $(MATH_LIBS)
+ endif # BUILD_SCRIPTREPLAY
+ 
+