softethervpn5: disable OQS module

The OQS module was enabled by default in 5.02.5186 with a massive size
increase. The OQS gets built-in and it's for support of Post Quantum
chiper.

Disable it by default to reduce the total size of the package.

If needed they will can be enabled again by compiling the
libopenssl-oqsprovider package that enable the OpenSSL provider for
these additional chiper.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

net/softethervpn5/Makefile

@@ -86,7 +86,9 @@ TARGET_CFLAGS += $(FPIC)
 CMAKE_HOST_OPTIONS += \
 	-DCURSES_CURSES_LIBRARY=$(STAGING_DIR_HOSTPKG)/lib/libncursesw.a \
 	-DCURSES_INCLUDE_PATH=$(STAGING_DIR_HOSTPKG)/include
-CMAKE_OPTIONS += -DICONV_LIB_PATH="$(ICONV_PREFIX)/lib"
+CMAKE_OPTIONS += \
+	-DOQS_ENABLE=OFF \
+	-DICONV_LIB_PATH="$(ICONV_PREFIX)/lib"
 
 # static build for host (hamcorebuilder), avoid -fpic on ncurses/host and shared libs can't be found on host
 define Host/Prepare

net/softethervpn5/patches/003-Mayaqua-build-allow-disabling-OQS.patch

@@ -0,0 +1,53 @@
+From 4bb366572d5ede4bcddd68ea5e20709e478327f5 Mon Sep 17 00:00:00 2001
+From: Dominique Martinet <dominique.martinet@atmark-techno.com>
+Date: Wed, 1 Oct 2025 17:41:57 +0900
+Subject: [PATCH] Mayaqua build: allow disabling OQS
+
+SoftEtherVPN version 5.02.5186 enable post-quantum algorithms, but these
+come at a large size increase (after strip, on x86_64, with default
+options as of master):
+- default options: 9.1M
+- new -DOQS_ENABLE=OFF: 762K
+
+Note it is also possible to disable all the algorithms individually by
+passing the (243!) options to cmake -DOQS_ENABLE_KEM_BIKE=OFF
+-DOQS_ENABLE_KEM_FRODOKEM=OFF -DOQS_ENABLE_KEM_NTRUPRIME=OFF ...,
+in which case the binary goes back to a reasonable size of 830K
+
+In the future, it might make sense to add a few settings picking
+"sensible" algorithms, e.g. allow everything for a server build or only
+allow the best algorithms for a lightweight client.
+
+See: #2148
+---
+ src/Mayaqua/CMakeLists.txt | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+--- a/src/Mayaqua/CMakeLists.txt
++++ b/src/Mayaqua/CMakeLists.txt
+@@ -18,9 +18,14 @@ set_target_properties(mayaqua
+ 
+ find_package(OpenSSL REQUIRED)
+ 
+-if(OPENSSL_VERSION VERSION_LESS "3") # Disable oqsprovider when OpenSSL version < 3
+-  add_definitions(-DSKIP_OQS_PROVIDER)
++if(OPENSSL_VERSION VERSION_GREATER_EQUAL "3")
++  set(OQS_ENABLE ON CACHE BOOL "By setting this to OFF, Open Quantum Safe algorithms will not be built in")
+ else()
++  # Disable oqsprovider when OpenSSL version < 3
++  set(OQS_ENABLE OFF)
++endif()
++
++if(OQS_ENABLE)
+   set(OQS_BUILD_ONLY_LIB ON CACHE BOOL "Set liboqs to build only the library (no tests)")
+   set(BUILD_TESTING OFF CACHE BOOL "By setting this to OFF, no tests or examples will be compiled.")
+   set(OQS_PROVIDER_BUILD_STATIC ON CACHE BOOL "Build a static library instead of a shared library") # Build oqsprovider as a static library (defaults to shared)
+@@ -32,6 +37,8 @@ else()
+   target_include_directories(oqsprovider PUBLIC ${CMAKE_CURRENT_BINARY_DIR}/3rdparty/liboqs/include)
+   set_property(TARGET oqsprovider PROPERTY POSITION_INDEPENDENT_CODE ON)
+   target_link_libraries(mayaqua PRIVATE oqsprovider)
++else()
++  add_definitions(-DSKIP_OQS_PROVIDER)
+ endif()
+ 
+ include(CheckSymbolExists)