ICU-20871 Fixed: no rule was defined to create the $(OUTDIR) directory if it didn't exist.
This would cause failures during cross compilation cases such as:
make[6]: Leaving directory '/spksrc/spk/bazarr/work-qoriq-6.1/icu/source/data'
make[5]: *** No rule to make target 'out', needed by 'out/icudt64b.dat'. Stop.
diff --git a/icu4c/source/data/Makefile.in b/icu4c/source/data/Makefile.in
index d1fb80f..e817ba4 100644
--- a/icu4c/source/data/Makefile.in
+++ b/icu4c/source/data/Makefile.in
@@ -150,6 +150,10 @@
ICUDATA_SOURCE_ARCHIVE = $(OUTDIR)/$(ICUDATA_PLATFORM_NAME).dat
$(ICUDATA_SOURCE_ARCHIVE): $(ICUDATA_ARCHIVE) $(OUTDIR)
$(INVOKE) $(TOOLBINDIR)/icupkg -t$(ICUDATA_CHAR) $(ICUDATA_ARCHIVE) $(ICUDATA_SOURCE_ARCHIVE)
+
+$(OUTDIR):
+ mkdir -p $(OUTDIR)
+
endif
else
ifneq ($(ENABLE_STATIC),YES)
