Added libmath to the linker flags when compiling test for llua

When trying to compile the test-program for the library, libmath is not in
the linker flags for some reason:

	./configure --host=arm-linux-gnu
	--with-lua-inc=/path/lua-5.1.4/included
	--with-lua-lib=/path/lua-5.1.4/lib

        configure: WARNING:
        *** Lua (>=5.0) headers and/or librairies couldn't be found in your system.
        *** Try to install liblua, liblualib and liblua-dev with your software

	configure:11664: gcc -o conftest -g -O2
	-I/path/lua-5.1.4/src
	-I/path/lua-5.1.4/src
	-L/path/lua-5.1.4/lib conftest.c
	-llua >&5

	In function `Arith':
	lvm.c:(.text+0x458): undefined reference to `pow'

Signed-off-by: Anders Palm <[email protected]>
Signed-off-by: Petr Štetiar <[email protected]>

Author: Anders Palm

configure.in

@@ -105,6 +105,7 @@ if test "x$enable_lua" = "xyes" ; then
         if test "x$ac_found_lua_header" = "xyes" -a "x$ac_found_liblua_header" = "xyes"; then
             LUA_CFLAGS="$CFLAGS"
         fi
+        LDFLAGS="$LDFLAGS -lm"
         for l in "$lua_suffix" "" "51" "5.1" "50" "5.0" ; do
             AC_CHECK_LIB(lua$l,lua_call,ac_found_lua_lib="yes",ac_found_lua_lib="no")
             if test "x$ac_found_lua_lib" = "xyes" ; then