* Make all depends required, thus deterministic.

* Redefine libcrypto dependency - there are no means of detection for
system OpenSSL on FreeBSD (e.g. no pkgconfig file), so we need to
point the build right to the library. Additionally, since OpenSSL
may also come from ports, respect OPENSSLLIB passed from the framework
to pick the right library. This works with system OpenSSL, _may_
work with OpenSSL from ports and will probably _not_ work with
OpenSSL form ports where OPENSSL_DEFAULT is set to base, as it will
still pick includes from /usr/local.

* Make sure to never detect gamemode which is missing on FreeBSD anyway.

--- meson.build.orig	2021-04-30 18:54:50 UTC
+++ meson.build
@@ -142,19 +142,19 @@ endif
 static = get_option('static') or ['emscripten', 'nx'].contains(host_machine.system())
 
 dep_freetype    = dependency('freetype2',                           required : true,  static : static, fallback : ['freetype', 'freetype_dep'])
-dep_opusfile    = dependency('opusfile',                            required : false, static : static, fallback : ['opusfile', 'opusfile_dep'])
+dep_opusfile    = dependency('opusfile',                            required : true, static : static, fallback : ['opusfile', 'opusfile_dep'])
 dep_png         = dependency('libpng',         version : '>=1.5',   required : true,  static : static, fallback : ['libpng', 'png_dep'])
 dep_sdl2        = dependency('sdl2',           version : '>=2.0.6', required : true,  static : static, fallback : ['sdl2', 'sdl2_dep'])
-dep_sdl2_mixer  = dependency('SDL2_mixer',     version : '>=2.0.4', required : false, static : static, fallback : ['sdl2_mixer', 'sdl2_mixer_dep'])
+dep_sdl2_mixer  = dependency('SDL2_mixer',     version : '>=2.0.4', required : true, static : static, fallback : ['sdl2_mixer', 'sdl2_mixer_dep'])
 dep_webp        = dependency('libwebp',        version : '>=0.5',   required : true,  static : static, fallback : ['libwebp', 'webpdecoder_dep'])
-dep_webpdecoder = dependency('libwebpdecoder', version : '>=0.5',   required : false, static : static)
-dep_zip         = dependency('libzip',         version : '>=1.2',   required : false, static : static, fallback : ['libzip', 'libzip_dep'])
+dep_webpdecoder = dependency('libwebpdecoder', version : '>=0.5',   required : true, static : static)
+dep_zip         = dependency('libzip',         version : '>=1.2',   required : true, static : static, fallback : ['libzip', 'libzip_dep'])
 dep_zlib        = dependency('zlib',                                required : true,  static : static, fallback : ['zlib', 'zlib_dep'])
 dep_cglm        = dependency('cglm',           version : '>=0.7.8', required : true,  static : static, fallback : ['cglm', 'cglm_dep'])
-dep_crypto      = dependency('libcrypto',                           required : false, static : static)
-dep_gamemode    = dependency('gamemode',                            required : false, static : static)
+dep_crypto      = cc.find_library('crypto', dirs : get_option('OPENSSLLIB'), required : true)
+dep_gamemode    = dependency('', required : false)
 
-dep_m           = cc.find_library('m', required : false)
+dep_m           = cc.find_library('m', required : true)
 
 dep_glad        = subproject('glad').get_variable('glad_dep')