pkgsStatic.libgpg-error: make tests pass

Correct config.h generated by ./configure to not attempt to use weak symbols
during static linking.

pkgs/development/libraries/libgpg-error/default.nix

@@ -37,13 +37,21 @@ in stdenv.mkDerivation (rec {
   nativeBuildInputs = [ gettext ];
 
   postConfigure =
-    lib.optionalString stdenv.isSunOS
     # For some reason, /bin/sh on OpenIndiana leads to this at the end of the
     # `config.status' run:
     #   ./config.status[1401]: shift: (null): bad number
     # (See <https://hydra.nixos.org/build/2931046/nixlog/1/raw>.)
     # Thus, re-run it with Bash.
-      "${stdenv.shell} config.status";
+    lib.optionalString stdenv.isSunOS ''
+      ${stdenv.shell} config.status
+    ''
+    # ./configure errorneous decides to use weak symbols on pkgsStatic,
+    # which, together with other defines results in locking functions in
+    # src/posix-lock.c to be no-op, causing tests/t-lock.c to fail.
+    + lib.optionalString stdenv.hostPlatform.isStatic ''
+      sed '/USE_POSIX_THREADS_WEAK/ d' config.h
+      echo '#undef USE_POSIX_THREADS_WEAK' >> config.h
+    '';
 
   doCheck = true; # not cross