src.opts.mk: enable OPENSSL_KTLS by default on riscv64

1e649491b8 enabled KERN_TLS in
riscv/conf/GENERIC, but didn't enable OPENSSL_KTLS.

This passes all testcases in the sys/kern/ssl_sendfile suite and
fixes CI failures seen here:
https://ci.freebsd.org/job/FreeBSD-main-riscv64-test/16606/testReport/sys.kern/ssl_sendfile/

PR:	293810
Fixes:	1e649491b8
MFC after:	3 days
Reviewed by:	gallatin, ngie
Differential Revision:	https://reviews.freebsd.org/D57316

share/man/man5/src.conf.5

@@ -1,5 +1,5 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
-.Dd April 22, 2026
+.Dd May 28, 2026
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -1514,12 +1514,12 @@ is set explicitly)
 Do not include kernel TLS support in OpenSSL.
 .Pp
 This is a default setting on
-arm/armv7, i386/i386 and riscv/riscv64.
+arm/armv7 and i386/i386.
 .It Va WITH_OPENSSL_KTLS
 Include kernel TLS support in OpenSSL.
 .Pp
 This is a default setting on
-amd64/amd64, arm64/aarch64, powerpc/powerpc64 and powerpc/powerpc64le.
+amd64/amd64, arm64/aarch64, powerpc/powerpc64, powerpc/powerpc64le and riscv/riscv64.
 .It Va WITHOUT_PAM
 Do not build PAM library and modules.
 .Bf -symbolic

share/mk/src.opts.mk

@@ -346,8 +346,8 @@ BROKEN_OPTIONS+=LOADER_IA32
 BROKEN_OPTIONS+=LOADER_GELI LOADER_LUA
 .endif
 
-# Kernel TLS is enabled by default on amd64, aarch64 and powerpc64*
-.if ${__T} == "aarch64" || ${__T} == "amd64" || ${__T:Mpowerpc64*} != ""
+# Kernel TLS is enabled by default on amd64, aarch64, powerpc64*, and riscv64*
+.if ${__T} == "aarch64" || ${__T} == "amd64" || ${__T:Mpowerpc64*} != "" || ${__T:Mriscv64*} != ""
 __DEFAULT_YES_OPTIONS+=OPENSSL_KTLS
 .else
 __DEFAULT_NO_OPTIONS+=OPENSSL_KTLS