php: drop 5.6 and 7.0

Both 5.6 and 7.0 is currently on life support, as in only recieving
security related patches.

This will only continue until:
 - 2018-12-31 for PHP 5.6
 - 2018-12-01 for PHP 7.0

Both these dates are in the middle of the 18.09 lifecycle. So it would
be nice to not have them in the 18.09 stable release. Dropping them
now would also result in less maintanance in updating them.

The death dates can be seen on both these links:
 - https://secure.php.net/supported-versions.php
 - https://en.wikipedia.org/wiki/PHP#Release_history

pkgs/development/interpreters/php/default.nix

@@ -9,14 +9,13 @@
 with lib;
 
 let
-  php7 = versionAtLeast version "7.0";
   generic =
   { version
   , sha256
   , imapSupport ? config.php.imap or (!stdenv.isDarwin)
   , ldapSupport ? config.php.ldap or true
   , mhashSupport ? config.php.mhash or true
-  , mysqlSupport ? (config.php.mysql or true) && (!php7)
+  , mysqlSupport ? (config.php.mysql or true)
   , mysqlndSupport ? config.php.mysqlnd or true
   , mysqliSupport ? config.php.mysqli or true
   , pdo_mysqlSupport ? config.php.pdo_mysql or true
@@ -26,7 +25,7 @@ let
   , bcmathSupport ? config.php.bcmath or true
   , socketsSupport ? config.php.sockets or true
   , curlSupport ? config.php.curl or true
-  , curlWrappersSupport ? (config.php.curlWrappers or true) && (!php7)
+  , curlWrappersSupport ? config.php.curlWrappers or true
   , gettextSupport ? config.php.gettext or true
   , pcntlSupport ? config.php.pcntl or true
   , postgresqlSupport ? config.php.postgresql or true
@@ -47,7 +46,7 @@ let
   , ftpSupport ? config.php.ftp or true
   , fpmSupport ? config.php.fpm or true
   , gmpSupport ? config.php.gmp or true
-  , mssqlSupport ? (config.php.mssql or (!stdenv.isDarwin)) && (!php7)
+  , mssqlSupport ? config.php.mssql or (!stdenv.isDarwin)
   , ztsSupport ? config.php.zts or false
   , calendarSupport ? config.php.calendar or true
   , sodiumSupport ? (config.php.sodium or true) && (versionAtLeast version "7.2")
@@ -207,7 +206,7 @@ let
         outputsToInstall = [ "out" "dev" ];
       };
 
-      patches = if !php7 then [ ./fix-paths.patch ] else [ ./fix-paths-php7.patch ];
+      patches = [ ./fix-paths-php7.patch ];
 
       postPatch = optional stdenv.isDarwin ''
         substituteInPlace configure --replace "-lstdc++" "-lc++"
@@ -220,16 +219,6 @@ let
     };
 
 in {
-  php56 = generic {
-    version = "5.6.36";
-    sha256 = "0ahp9vk33dpsqgld0gg4npff67v0l39hs3wk5dm6h3lablzhwsk2";
-  };
-
-  php70 = generic {
-    version = "7.0.30";
-    sha256 = "0l0bhnlgxmfl7mrdykmxfl53simxsksdcnbg5ymqz6r31i03hgr1";
-  };
-
   php71 = generic {
     version = "7.1.19";
     sha256 = "1wvhsxzmb78pcr36ginz93iv7rcrxp3p01rb34zxa2h4wdxkxi0k";

pkgs/top-level/all-packages.nix

@@ -7419,14 +7419,6 @@ with pkgs;
   php = php72;
   phpPackages = php72Packages;
 
-  php56Packages = recurseIntoAttrs (callPackage ./php-packages.nix {
-    php = php56;
-  });
-
-  php70Packages = recurseIntoAttrs (callPackage ./php-packages.nix {
-    php = php70;
-  });
-
   php71Packages = recurseIntoAttrs (callPackage ./php-packages.nix {
     php = php71;
   });
@@ -7437,8 +7429,6 @@ with pkgs;
 
 
   inherit (callPackages ../development/interpreters/php { })
-    php56
-    php70
     php71
     php72;