postgresql: reorganize musl patches (#260067)

This also adds support for building postgresql 15 and 16 under musl.

pkgs/servers/sql/postgresql/default.nix

···
         locale = "${if stdenv.isDarwin then darwin.adv_cmds else lib.getBin stdenv.cc.libc}/bin/locale";
       })
 
-    ] ++ lib.optionals (stdenv'.hostPlatform.isMusl && atLeast "12") [
-      (fetchpatch {
-        url = "https://git.alpinelinux.org/aports/plain/main/postgresql14/icu-collations-hack.patch?id=56999e6d0265ceff5c5239f85fdd33e146f06cb7";
-        hash = "sha256-Yb6lMBDqeVP/BLMyIr5rmR6OkaVzo68cV/+cL2LOe/M=";
-      })
-    ] ++ lib.optionals (stdenv'.hostPlatform.isMusl && atLeast "13") [
-      (if olderThan "14" then
-        fetchpatch {
-           url = "https://git.alpinelinux.org/aports/plain/main/postgresql13/disable-test-collate.icu.utf8.patch?id=69faa146ec9fff3b981511068f17f9e629d4688b";
-           hash = "sha256-IOOx7/laDYhTz1Q1r6H1FSZBsHCgD4lHvia+/os7CCo=";
-         }
-       else
-         fetchpatch {
-           url = "https://git.alpinelinux.org/aports/plain/main/postgresql14/disable-test-collate.icu.utf8.patch?id=56999e6d0265ceff5c5239f85fdd33e146f06cb7";
-           hash = "sha256-pnl+wM3/IUyq5iJzk+h278MDA9R0GQXQX8d4wJcB2z4=";
-         })
-    ] ++ lib.optionals stdenv'.isLinux  [
+    ] ++ lib.optionals stdenv'.hostPlatform.isMusl (
+      let
+        self = {
+          "12" = {
+            icu-collations-hack = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/testing/postgresql12/icu-collations-hack.patch?id=d5227c91adda59d4e7f55f13468f0314e8869174";
+              hash = "sha256-wuwjvGHArkRNwFo40g3p43W32OrJohretlt6iSRlJKg=";
+            };
+          };
+          "13" = {
+            inherit (self."14") icu-collations-hack;
+            disable-test-collate-icu-utf8 = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/main/postgresql13/disable-test-collate.icu.utf8.patch?id=69faa146ec9fff3b981511068f17f9e629d4688b";
+              hash = "sha256-jS/qxezaiaKhkWeMCXwpz1SDJwUWn9tzN0uKaZ3Ph2Y=";
+            };
+          };
+          "14" = {
+            icu-collations-hack = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/main/postgresql14/icu-collations-hack.patch?id=56999e6d0265ceff5c5239f85fdd33e146f06cb7";
+              hash = "sha256-wuwjvGHArkRNwFo40g3p43W32OrJohretlt6iSRlJKg=";
+            };
+            disable-test-collate-icu-utf8 = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/main/postgresql14/disable-test-collate.icu.utf8.patch?id=56999e6d0265ceff5c5239f85fdd33e146f06cb7";
+              hash = "sha256-jXe23AxnFjEl+TZQm4R7rStk2Leo08ctxMNmu1xr5zM=";
+            };
+          };
+          "15" = {
+            icu-collations-hack = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/main/postgresql15/icu-collations-hack.patch?id=f424e934e6d076c4ae065ce45e734aa283eecb9c";
+              hash = "sha256-HgtmhF4OJYU9macGJbTB9PjQi/yW7c3Akm3U0niWs8I=";
+            };
+          };
+          "16" = {
+            icu-collations-hack = fetchurl {
+              url = "https://git.alpinelinux.org/aports/plain/main/postgresql16/icu-collations-hack.patch?id=08a24be262339fd093e641860680944c3590238e";
+              hash = "sha256-+urQdVIlADLdDPeT68XYv5rljhbK8M/7mPZn/cF+FT0=";
+            };
+          };
+        };
+
+        patchesForVersion = self.${lib.versions.major version} or (throw "no musl patches for postgresql ${version}");
+      in
+        lib.attrValues patchesForVersion
+    ) ++ lib.optionals stdenv'.isLinux  [
       (if atLeast "13" then ./patches/socketdir-in-run-13.patch else ./patches/socketdir-in-run.patch)
     ];