build: fix GTK/OpenSSL warnings + tab color OOB

plugins/fishlim/meson.build

@@ -16,6 +16,7 @@ fishlim_sources = [
 
 shared_module('fishlim', fishlim_sources,
   dependencies: [libgio_dep, zoitechat_plugin_dep, libssl_dep],
+  c_args: ['-DOPENSSL_API_COMPAT=0x10100000L'],
   install: true,
   install_dir: plugindir,
   name_prefix: '',

plugins/sysinfo/meson.build

@@ -19,10 +19,6 @@ if system == 'linux' or system == 'gnu' or system.startswith('gnu/') or system =
     'shared/df.c'
   ]
 
-  if get_option('gtk-frontend')
-    sysinfo_cargs += '-DUSE_GTK_FRONTEND'
-  endif
-
   if system == 'linux' or system == 'gnu' or system.startswith('gnu/') or system == 'freebsd'
     libpci = dependency('libpci', required: false, method: 'pkg-config')
     if libpci.found()