build: Drop conditional use of get_supported_link_arguments()

Meson complains even in the face of a version check.

src/meson.build

@@ -50,11 +50,7 @@ epoxy_sources = sources + gen_sources
 common_ldflags = []
 
 if host_system == 'linux' and cc.get_id() == 'gcc'
-  if meson.version().version_compare('>= 0.46.0')
-    common_ldflags += cc.get_supported_link_arguments([ '-Wl,-Bsymbolic-functions', '-Wl,-z,relro' ])
-  else
-    common_ldflags += [ '-Wl,-Bsymbolic-functions', '-Wl,-z,relro', ]
-  endif
+  common_ldflags += cc.get_supported_link_arguments([ '-Wl,-Bsymbolic-functions', '-Wl,-z,relro' ])
 endif
 
 # Maintain compatibility with autotools; see: https://github.com/anholt/libepoxy/issues/108