japanese/mozc-server: Fix build with protobuf 22+

japanese/mozc-server/Makefile

@@ -23,11 +23,14 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	hrs-allbsd
 GH_TUPLE=	hiroyuki-komatsu:japanese-usage-dictionary:e5b3425:udic
 
-USES=		compiler:c++11-lang gmake ninja:build pkgconfig \
+USES=		compiler:c++17-lang gmake ninja:build pkgconfig \
 		python:build shebangfix tar:bzip2
 SHEBANG_FILES=	src/build_mozc.py
 BUILD_WRKSRC=	${WRKSRC}/src
 
+LDFLAGS+=	-labsl_spinlock_wait
+USE_CXXSTD=	c++17
+
 BUILD_MOZC_LIST?=	mozc_server
 
 .if ${BUILD_MOZC_LIST:Mmozc_server} == "mozc_server"