dev-libs/icu: add upstream patch for test failure

This may cause runtime breakage (not just a failure
in a test, but exposed by it on hppa and actually riscv) and
it's a straightforward patch, so let's `git mv` in stable.

Bug: https://bugs.gentoo.org/788112
Closes: https://bugs.gentoo.org/807893
Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/icu/files/icu-69.1-fix-ub-units.patch

@@ -0,0 +1,23 @@
+https://github.com/unicode-org/icu/pull/1715
+https://bugs.gentoo.org/788112
+
+From 29f1188d191a7a75ac7ffa4bfa390f625da39c53 Mon Sep 17 00:00:00 2001
+From: Andreas Schwab <schwab@suse.de>
+Date: Tue, 11 May 2021 19:04:24 +0200
+Subject: [PATCH] ICU-21613 Fix undefined behaviour in
+ ComplexUnitsConverter::applyRounder
+
+--- a/i18n/units_complexconverter.cpp
++++ b/i18n/units_complexconverter.cpp
+@@ -237,6 +237,11 @@ void ComplexUnitsConverter::applyRounder(MaybeStackArray<int64_t, 5> &intValues,
+     }
+     quantity = decimalQuantity.toDouble();
+ 
++    if (uprv_isNaN(quantity) || uprv_isInfinite(quantity)) {
++        // Do nothing for non-finite values, since conversion to int64_t is undefined
++        return;
++    }
++
+     int32_t lastIndex = unitsConverters_.length() - 1;
+     if (lastIndex == 0) {
+         // Only one element, no need to bubble up the carry

dev-libs/icu/icu-69.1-r1.ebuild

@@ -32,6 +32,9 @@ PATCHES=(
 	"${FILESDIR}/${PN}-65.1-remove-bashisms.patch"
 	"${FILESDIR}/${PN}-64.2-darwin.patch"
 	"${FILESDIR}/${PN}-68.1-nonunicode.patch"
+	# Should be in the next rleease, but check
+	# https://bugs.gentoo.org/788112
+	"${FILESDIR}/${PN}-69.1-fix-ub-units.patch"
 )
 
 src_prepare() {