overlay: autoreconf some packages

Manually add the autoreconfHook to some packages that build only static
libraries otherwise. Adding every library with this problem is not a
practical solution but in the short term it is useful for finding other
problems.

overlay/default.nix

@@ -19,6 +19,18 @@ let
     overrideTargetAttrs drv
     (attrs: { patches = attrs.patches or [ ] ++ [ patch ]; });
 
+  nullForHost = pkg: if hostPlatform.isGenode then null else pkg;
+
+  reconfForHost = pkg:
+    if hostPlatform.isGenode then
+      pkg.overrideAttrs (attrs: {
+        nativeBuildInputs = attrs.nativeBuildInputs or [ ]
+          ++ [ final.autoreconfHook final.gnum4 ];
+        M4 = "${final.buildPackages.gnum4}/bin/m4";
+      })
+    else
+      pkg;
+
 in {
 
   bash = overrideTargetAttrs bash (attrs: {
@@ -32,6 +44,8 @@ in {
     nativeBuildInputs = [ final.updateAutotoolsGnuConfigScriptsHook ];
   });
 
+  c-ares = reconfForHost c-ares;
+
   cmake = overrideTargetAttrs cmake (attrs: {
     postInstall = with stdenv; ''
       local MODULE="$out/share/cmake-${
@@ -81,6 +95,10 @@ in {
     else
       prev.libcCrossChooser name;
 
+  libev = reconfForHost libev;
+
+  libssh2 = reconfForHost libssh2;
+
   libsodium = overrideHostAttrs libsodium (attrs: {
     patches = (attrs.patches or [ ]) ++ [ ./libsodium/genode.patch ];
   });
@@ -125,7 +143,7 @@ in {
       "rm $out/bin/c_rehash"; # eliminate the perl runtime dependency
   });
 
-  popt = if hostPlatform.isGenode then null else popt; # libtool problems
+  popt = nullForHost popt; # libtool problems
 
   rsync = overrideHost rsync { enableACLs = false; };