icu: Add patch to fix race condition in parallel builds.

The yearistype.sh script did not depend on the extraction of the tzdata
archive.

dev-libs/icu/patches/icu-55.1.patchset

@@ -172,3 +172,32 @@ index 89902b4..9f3b893 100644
 2.2.2
 
 
+From 093540e0271aad6cc2aa23bfd8af1e37d04c5ef4 Mon Sep 17 00:00:00 2001
+From: Michael Lotz <mmlr@mlotz.ch>
+Date: Sat, 19 Dec 2015 14:44:35 +0000
+Subject: [PATCH] Fix missing dependency of yearistype.sh to tzdata extraction.
+
+This caused parallel builds to fail because the script file wasn't yet
+extracted when it was copied. The regression was introduced in r26995
+when the dependency was reused for TDATA which yearistype.sh isn't part
+of.
+---
+ source/tools/tzcode/Makefile.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/source/tools/tzcode/Makefile.in b/source/tools/tzcode/Makefile.in
+index b6ec447..d97e485 100644
+--- a/source/tools/tzcode/Makefile.in
++++ b/source/tools/tzcode/Makefile.in
+@@ -125,7 +125,7 @@ $(ICUZDUMPTARG):	$(srcdir)/icuzdump.cpp
+ 		$(LINK.cc)  -I$(srcdir) -I$(top_srcdir)/common -I$(top_srcdir)/i18n -I$(top_srcdir)/tools/toolutil -I$(top_srcdir)/io  -pedantic $(srcdir)/icuzdump.cpp $(LIBICUUC) $(LIBICUDT) $(LIBICUI18N) $(LIBICUIO) $(LIBICUTOOLUTIL) -o $@
+ 
+ 
+-$(TDATA): tdatamarker
++$(TDATA) $(XDATA): tdatamarker
+ 
+ tdatamarker: $(TZDATA)
+ 	gunzip -d < $(TZDATA) | tar xf - --exclude=Makefile
+-- 
+2.2.2
+