dev-libs/zxcvbn-c: Fix parallel build

Closes: https://bugs.gentoo.org/958271
Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

dev-libs/zxcvbn-c/files/zxcvbn-c-2.5-parallel-build.patch

@@ -0,0 +1,33 @@
+From 2c454989547390c944d02823b751e8ff4a3963e5 Mon Sep 17 00:00:00 2001
+From: Pavel Seleznev <PNSeleznev@sberbank.ru>
+Date: Wed, 19 Jun 2024 12:17:49 +0300
+Subject: [PATCH] fixed flaky build: in parallel mode the creation link
+ operation can be happen in two threads
+
+---
+ makefile | 5 ++---
+ 1 file changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/makefile b/makefile
+index 11ebe28..9ba626d 100644
+--- a/makefile
++++ b/makefile
+@@ -79,8 +79,7 @@ test-c++file: test.c zxcvbn-c++file.o
+ 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) \
+ 		-DUSE_DICT_FILE -o test-c++file test.cpp zxcvbn-c++file.o $(LDFLAGS) -lm
+ 
+-zxcvbn-c++file.o: zxcvbn.c dict-crc.h zxcvbn.h 
+-	if [ ! -e zxcvbn.cpp ]; then ln -s zxcvbn.c zxcvbn.cpp; fi
++zxcvbn-c++file.o: zxcvbn.c dict-crc.h zxcvbn.h zxcvbn-c++inline.o
+ 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) \
+ 		-DUSE_DICT_FILE -c -o zxcvbn-c++file.o zxcvbn.cpp
+ 
+@@ -102,7 +101,7 @@ test: test-internals test-file test-inline test-c++inline test-c++file test-shli
+ 	@echo Finished
+ 
+ clean:
+-	rm -f test-file zxcvbn-file.o test-c++file zxcvbn-c++file.o 
++	rm -f test-file zxcvbn-file.o test-c++file zxcvbn-c++file.o
+ 	rm -f test-inline test-internals zxcvbn-inline.o zxcvbn-inline-pic.o test-c++inline zxcvbn-c++inline.o
+ 	rm -f dict-*.h zxcvbn.dict zxcvbn.cpp test.cpp
+ 	rm -f dictgen

dev-libs/zxcvbn-c/zxcvbn-c-2.5.ebuild

@@ -15,6 +15,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-libcxx-19.patch
 	"${FILESDIR}"/${P}-gcc15.patch
 	"${FILESDIR}"/${PN}-2.5-makefile-install.patch
+	"${FILESDIR}"/${PN}-2.5-parallel-build.patch # bug 958271
 )
 
 src_install() {