[docs] detail about openssl on solaris

Signed-off-by: lizzie <lizzie@eden-emu.dev>

docs/build/Solaris.md

@@ -27,7 +27,7 @@ Patch for FFmpeg:
 sed -i 's/ make / gmake /' externals/ffmpeg/CMakeFiles/ffmpeg-build.dir/build.make
 ```
 
-- **Configure**: `cmake -B build -DENABLE_WEB_SERVICE=OFF`.
+- **Configure**: `cmake -B build -DENABLE_WEB_SERVICE=OFF -DENABLE_OPENSSL=OFF`.
 - **Build**: `cmake --build build`.
 - **Installing**: `sudo cmake --install build`.
 
@@ -48,3 +48,4 @@ export LIBGL_ALWAYS_SOFTWARE=1
 
 - Modify the generated ffmpeg.make (in build dir) if using multiple threads (base system `make` doesn't use `-j4`, so change for `gmake`).
 - If using OpenIndiana, due to a bug in SDL2 cmake configuration; Audio driver defaults to SunOS `<sys/audioio.h>`, which does not exist on OpenIndiana.
+- System OpenSSL is too old and must be build from source to use it