Bump Relx to 4.7.0

- [Use `erlexec` directly in relx helper functions](erlware/relx#902)
- [Make rlx_util:parse_vsn parse integer versions](erlware/relx#913)
- [fix awk script check_name() in extended_bin](erlware/relx#915)
- [avoid crash when overlay is malformed](erlware/relx#916)
- [keep attributes when stripping beams](erlware/relx#906)
- [Fix {include_erts,true} in Windows releases](erlware/relx#914)
- [ensure the erl file is writable before copying dyn_erl to it](erlware/relx#903)
- Various tests added

rebar.config

@@ -7,7 +7,7 @@
         {providers,        "1.9.0"},
         {getopt,           "1.0.1"},
         {bbmustache,       "1.12.2"},
-        {relx,             "4.6.0"},
+        {relx,             "4.7.0"},
         {cf,               "0.3.1"},
         {cth_readable,     "1.5.1"},
         {eunit_formatters, "0.5.0"}]}.

rebar.lock

@@ -7,7 +7,7 @@
  {<<"eunit_formatters">>,{pkg,<<"eunit_formatters">>,<<"0.5.0">>},0},
  {<<"getopt">>,{pkg,<<"getopt">>,<<"1.0.1">>},0},
  {<<"providers">>,{pkg,<<"providers">>,<<"1.9.0">>},0},
- {<<"relx">>,{pkg,<<"relx">>,<<"4.6.0">>},0},
+ {<<"relx">>,{pkg,<<"relx">>,<<"4.7.0">>},0},
  {<<"ssl_verify_fun">>,{pkg,<<"ssl_verify_fun">>,<<"1.1.6">>},0}]}.
 [
 {pkg_hash,[
@@ -19,7 +19,7 @@
  {<<"eunit_formatters">>, <<"6A9133943D36A465D804C1C5B6E6839030434B8879C5600D7DDB5B3BAD4CCB59">>},
  {<<"getopt">>, <<"C73A9FA687B217F2FF79F68A3B637711BB1936E712B521D8CE466B29CBF7808A">>},
  {<<"providers">>, <<"46F6645B0C677B1029E02B013BFD69092A2232854DAF359F2378FA42AC0BEC0D">>},
- {<<"relx">>, <<"939DB831A63CC35A7850C99DCC758FE9F3900E32E1DAB7CBB34E5306CAF53168">>},
+ {<<"relx">>, <<"CF8F3ECA5FAF0D25746AFAA4042DA4B5061E2CFFC9C190632C6E4F2C20A47573">>},
  {<<"ssl_verify_fun">>, <<"CF344F5692C82D2CD7554F5EC8FD961548D4FD09E7D22F5B62482E5AEAEBD4B0">>}]},
 {pkg_hash_ext,[
  {<<"bbmustache">>, <<"688B33A4D5CC2D51F575ADF0B3683FC40A38314A2F150906EDCFC77F5B577B3B">>},
@@ -30,6 +30,6 @@
  {<<"eunit_formatters">>, <<"D6C8BA213424944E6E05BBC097C32001CDD0ABE3925D02454F229B20D68763C9">>},
  {<<"getopt">>, <<"53E1AB83B9CEB65C9672D3E7A35B8092E9BDC9B3EE80721471A161C10C59959C">>},
  {<<"providers">>, <<"D287E874406A1505608642B0A3DB5B68D6ADA3F2AB001AEC87E7F4D7C79FC017">>},
- {<<"relx">>, <<"2FF8131C63093C621C6B37DC52D1B2848A938886584B4B701D35BDBE4377F509">>},
+ {<<"relx">>, <<"A2ABFAFA70BCE3A0B98A6E5140AC98429B9980F835FFB47357F0645422FC2FA3">>},
  {<<"ssl_verify_fun">>, <<"BDB0D2471F453C88FF3908E7686F86F9BE327D065CC1EC16FA4540197EA04680">>}]}
 ].