proxysql: fix build after 201859

- by not pulling in python2 directly
- by applying patches to sources we "unvendor", so e.g. libinjection builds

pkgs/servers/sql/proxysql/default.nix

@@ -1,5 +1,6 @@
 { stdenv
 , lib
+, applyPatches
 , fetchFromGitHub
 , autoconf
 , automake
@@ -23,9 +24,10 @@
 , openssl
 , pcre
 , perl
-, python2
+, python3
 , re2
 , zlib
+, texinfo
 }:
 
 stdenv.mkDerivation rec {
@@ -50,7 +52,8 @@ stdenv.mkDerivation rec {
     cmake
     libtool
     perl
-    python2
+    python3
+    texinfo  # for makeinfo
   ];
 
   buildInputs = [
@@ -65,6 +68,10 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  # otherwise, it looks for …-1.15
+  ACLOCAL = "aclocal";
+  AUTOMAKE = "automake";
+
   GIT_VERSION = version;
 
   dontConfigure = true;
@@ -94,18 +101,27 @@ stdenv.mkDerivation rec {
     }
 
     ${lib.concatMapStringsSep "\n"
-      (x: ''replace_dep "${x.f}" "${x.p.src}" "${x.p.pname or (builtins.parseDrvName x.p.name).name}" "${x.p.name}"'') [
-        { f = "curl"; p = curl; }
-        { f = "libconfig"; p = libconfig; }
-        { f = "libdaemon"; p = libdaemon; }
-        { f = "libev"; p = libev; }
-        { f = "libinjection"; p = libinjection; }
-        { f = "libmicrohttpd"; p = libmicrohttpd_0_9_69; }
-        { f = "libssl"; p = openssl; }
-        { f = "lz4"; p = lz4; }
-        { f = "pcre"; p = pcre; }
-        { f = "re2"; p = re2; }
-    ]}
+      (x: ''replace_dep "${x.f}" "${x.p.src}" "${x.p.pname or (builtins.parseDrvName x.p.name).name}" "${x.p.name}"'') (
+        map (x: {
+          inherit (x) f;
+          p = x.p // {
+            src = applyPatches {
+              inherit (x.p) src patches;
+            };
+          };
+        }) [
+          { f = "curl"; p = curl; }
+          { f = "libconfig"; p = libconfig; }
+          { f = "libdaemon"; p = libdaemon; }
+          { f = "libev"; p = libev; }
+          { f = "libinjection"; p = libinjection; }
+          { f = "libmicrohttpd"; p = libmicrohttpd_0_9_69; }
+          { f = "libssl"; p = openssl; }
+          { f = "lz4"; p = lz4; }
+          { f = "pcre"; p = pcre; }
+          { f = "re2"; p = re2; }
+        ]
+      )}
 
     pushd libhttpserver
     tar xf libhttpserver-0.18.1.tar.gz