Upgrade Ruby to 3.3.0

https://www.ruby-lang.org/en/news/2023/12/25/ruby-3-3-0-released/

main/ruby/APKBUILD

@@ -138,8 +138,8 @@ build() {
 	# -O2 - ruby is a language runtime, so performance is crucial. Moreover,
 	#  ruby 3.1.1 fails with Bus Error when compiled with -Os on armhf/armv7.
 	#  This makes ruby-libs 7% bigger (13.4 -> 14.4 MiB).
-	export CFLAGS="${CFLAGS/-Os/-O2} -fno-omit-frame-pointer -fno-strict-aliasing"
-	export CPPFLAGS="${CPPFLAGS/-Os/-O2} -fno-omit-frame-pointer -fno-strict-aliasing"
+	export CFLAGS="${CFLAGS/-Os/} -fno-omit-frame-pointer -fno-strict-aliasing"
+	export CPPFLAGS="${CPPFLAGS/-Os/} -fno-omit-frame-pointer -fno-strict-aliasing"
 
 	# Needed for coroutine stuff
 	export LIBS="-lucontext"
@@ -147,6 +147,12 @@ build() {
 	# ruby saves path to install. we want use $PATH
 	export INSTALL=install
 
+	case "$CARCH" in
+		# Ruby segfaults when built with default (-O3).
+		# See https://bugs.ruby-lang.org/issues/20099.
+		s390x) export optflags="-O2";;
+	esac
+
 	# the configure script does not detect isnan/isinf as macros
 	export ac_cv_func_isnan=yes
 	export ac_cv_func_isinf=yes