Pr/keep alive update

.gitignore

@@ -125,3 +125,4 @@ CMakeSettings.json
 /ci-artifacts/
 /out/
 /.cache/
+/.notes/

3rdparty/groovymister/CMakeLists.txt

@@ -0,0 +1,33 @@
+add_library(groovymister STATIC
+	groovymister.cpp
+	groovymister_wrapper.cpp
+	nlc_codec.cpp
+)
+
+# Static link into PCSX2: makes the gmw_* wrapper symbols non-dllexport, so there
+# is no runtime dlopen surface.
+target_compile_definitions(groovymister PUBLIC
+	GROOVYMISTER_WIN32_STATIC
+)
+
+target_include_directories(groovymister SYSTEM PUBLIC
+	"${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+# LZ4: use PCSX2's, do NOT bundle our own.
+#
+# Upstream Groovy_MiSTer ships a copy of LZ4 under api/lz4/. PCSX2 already links LZ4
+# (find_package(LZ4) / lz4.lib on Windows), so compiling a second static copy defines every
+# LZ4 symbol twice and the final link fails (LNK2005 / duplicate symbol). Upstream's
+# GM_SYSTEM_LZ4 switch selects <lz4.h>/<lz4hc.h> over the bundled copy, which we do not
+# vendor. The client only calls LZ4_compress_default and LZ4_compress_HC, both long-stable API.
+target_compile_definitions(groovymister PRIVATE GM_SYSTEM_LZ4)
+target_link_libraries(groovymister PUBLIC LZ4::LZ4)
+
+if(WIN32)
+	# Winsock. RIO (the low-latency UDP send path) is resolved at runtime via
+	# WSAIoctl into a function-pointer table, so mswsock.lib is not required.
+	target_link_libraries(groovymister PUBLIC ws2_32)
+endif()
+
+disable_compiler_warnings_for_target(groovymister)