Fix improper usage of macro that introduces a wrong newline

The MD_CONF_FLAGS() macro was used with a final newline that
introduces an invalid newline in the middle of the macro expansion
when defining LDFLAGS.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Index: libhid-0.2.16/configure.ac
===================================================================
--- libhid-0.2.16.orig/configure.ac	2007-04-01 22:32:10.000000000 +0200
+++ libhid-0.2.16/configure.ac	2012-12-12 20:24:03.000000000 +0100
@@ -102,8 +102,7 @@
   [],
   [$OS_CFLAGS $LIBUSB_CFLAGS],
   [],
-  [$OS_LDFLAGS $LIBUSB_LIBS]
-)
+  [$OS_LDFLAGS $LIBUSB_LIBS])
 
 MD_CONF_DB2MAN