bazel: bazelRC path set by a patch

In bazel source code change in the future, patch will fail and we'll
detect the regression sooner.

pkgs/development/tools/build-managers/bazel/bazel_rc.patch

@@ -0,0 +1,13 @@
+diff --git a/src/main/cpp/option_processor.cc b/src/main/cpp/option_processor.cc
+index 8f8f15685f..a7ae52d1e4 100644
+--- a/src/main/cpp/option_processor.cc
++++ b/src/main/cpp/option_processor.cc
+@@ -56,7 +56,7 @@ OptionProcessor::OptionProcessor(
+     : workspace_layout_(workspace_layout),
+       startup_options_(std::move(default_startup_options)),
+       parse_options_called_(false),
+-      system_bazelrc_path_(BAZEL_SYSTEM_BAZELRC_PATH) {}
++      system_bazelrc_path_("@bazelSystemBazelRCPath@") {}
+ 
+ OptionProcessor::OptionProcessor(
+     const WorkspaceLayout* workspace_layout,

pkgs/development/tools/build-managers/bazel/default.nix

@@ -171,6 +171,13 @@ stdenv.mkDerivation rec {
       src = ./strict_action_env.patch;
       strictActionEnvPatch = defaultShellPath;
     })
+
+    # bazel reads its system bazelrc in /etc
+    # override this path to a builtin one
+    (substituteAll {
+      src = ./bazel_rc.patch;
+      bazelSystemBazelRCPath = bazelRC;
+    })
   ] ++ lib.optional enableNixHacks ./nix-hacks.patch;
 
 
@@ -431,12 +438,6 @@ stdenv.mkDerivation rec {
       mv runfiles.bash.tmp tools/bash/runfiles/runfiles.bash
 
       patchShebangs .
-
-      # bazel reads its system bazelrc in /etc
-      # override this path to a builtin one
-      substituteInPlace \
-        src/main/cpp/option_processor.cc \
-        --replace BAZEL_SYSTEM_BAZELRC_PATH "\"${bazelRC}\""
     '';
     in lib.optionalString stdenv.hostPlatform.isDarwin darwinPatches
      + genericPatches;