Fix a parallel make race where cdefs.h uses the unused-parameter.h header file
but has no dependency listed. This can result in an empty cdefs.h file which 
results in a build failure like:

| In file included from striconveh.c:30:0:
| unistr.h:193:48: error: expected ';', ',' or ')' before '_GL_UNUSED_PARAMETER'
| In file included from striconveh.c:30:0:
| unistr.h:263:54: error: expected ';', ',' or ')' before '_GL_UNUSED_PARAMETER'

Upstream-Status: Pending

RP 2012/4/12

Index: libunistring-0.9.3/lib/Makefile.am
===================================================================
--- libunistring-0.9.3.orig/lib/Makefile.am	2012-04-12 07:45:41.450059820 +0000
+++ libunistring-0.9.3/lib/Makefile.am	2012-04-12 07:48:45.434055559 +0000
@@ -157,7 +157,7 @@
 
 # unistring/cdefs.h is not public, but is included by other header files.
 nobase_nodist_include_HEADERS += unistring/cdefs.h
-unistring/cdefs.h : unistring/cdefs.in.h
+unistring/cdefs.h : unistring/cdefs.in.h $(UNUSED_PARAMETER_H)
 	@MKDIR_P@ unistring
 	rm -f $@-t $@
 	sed -e '/definition of _GL_UNUSED_PARAMETER/r $(UNUSED_PARAMETER_H)' \