OVMF: fix buils against openssl-3.0.13

Without the change the build fails on `staging-next` as
https://hydra.nixos.org/build/248863953/nixlog/2/tail:

    /build/edk2-unvendored-src/CryptoPkg/Library/OpensslLib/openssl/crypto/property/property_parse.c:107:19: error: ‘INT64_MAX’ undeclared (first use in this function)
      107 |         if (v > ((INT64_MAX - (*s - '0')) / 10)) {
          |                   ^~~~~~~~~

The unbundled version of `openssl` `nixpkgs` injects into `edk2` started
using `INT64_MAX` that `edk2`'s `<stdint.h>` does not provide and relies
on `openssl` to define as a fallback.

Let's pull in `openssl`'s own definition of those.

pkgs/development/compilers/edk2/default.nix

@@ -59,6 +59,11 @@ edk2 = stdenv.mkDerivation rec {
     mkdir -p $out/CryptoPkg/Library/OpensslLib/openssl
     tar --strip-components=1 -xf ${buildPackages.openssl.src} -C $out/CryptoPkg/Library/OpensslLib/openssl
     chmod -R +w $out/
+
+    # Fix missing INT64_MAX include that edk2 explicitly does not provide
+    # via it's own <stdint.h>. Let's pull in openssl's definition instead:
+    sed -i $out/CryptoPkg/Library/OpensslLib/openssl/crypto/property/property_parse.c \
+        -e '1i #include "internal/numbers.h"'
   '';
 
   nativeBuildInputs = [ pythonEnv ];