Only suppress deprecation warnings on OTP 23

For OTP 19 and earlier compatibility.

src/r3_hex_api.erl

@@ -28,7 +28,11 @@ put(Config, Path, Body) ->
 delete(Config, Path) ->
     request(Config, delete, Path, undefined).
 
--compile({nowarn_deprecated_function, [{http_uri, encode, 1}]}).
+-ifdef (OTP_RELEASE).
+  -if(?OTP_RELEASE >= 23).
+    -compile({nowarn_deprecated_function, [{http_uri, encode, 1}]}).
+  -endif.
+-endif.
 
 %% @private
 encode_query_string(List) ->

src/rebar_git_resource.erl

@@ -100,8 +100,12 @@ compare_url(Dir, Url) ->
     ?DEBUG("Comparing git url ~p with ~p", [ParsedUrl, ParsedCurrentUrl]),
     ParsedCurrentUrl =:= ParsedUrl.
 
--compile({nowarn_deprecated_function, [{http_uri, parse, 2},
-                                       {http_uri, scheme_defaults, 0}]}).
+-ifdef (OTP_RELEASE).
+  -if(?OTP_RELEASE >= 23).
+    -compile({nowarn_deprecated_function, [{http_uri, parse, 2},
+                                           {http_uri, scheme_defaults, 0}]}).
+  -endif.
+-endif.
 
 parse_git_url(Url) ->
     %% Checks for standard scp style git remote

src/rebar_utils.erl

@@ -908,8 +908,12 @@ get_http_vars(Scheme) ->
     Config = rebar_config:consult_file(GlobalConfigFile),
     proplists:get_value(Scheme, Config, OS).
 
--compile({nowarn_deprecated_function, [{http_uri, parse, 1},
-                                       {http_uri, decode, 1}]}).
+-ifdef (OTP_RELEASE).
+  -if(?OTP_RELEASE >= 23).
+    -compile({nowarn_deprecated_function, [{http_uri, parse, 1},
+                                           {http_uri, decode, 1}]}).
+  -endif.
+-endif.
 
 set_httpc_options() ->
     set_httpc_options(https_proxy, get_http_vars(https_proxy)),