Fix Windows Builds For Blst (#7803)

* checkpoint

* fixWindowsBuils add transitive includes to mingw toolchain

* comment

Co-authored-by: SuburbanDad <gts.mobile@gmail.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

tools/cross-toolchain/cc_toolchain.BUILD.bazel.tpl

@@ -85,8 +85,8 @@ cc_toolchain(
     name = "cc-mingw-amd64",
     all_files = ":empty",
     ar_files = ":empty",
-    as_files = ":mingw_compiler_files",
-    compiler_files = ":mingw_compiler_files",
+    as_files = ":empty",
+    compiler_files = ":empty",
     dwp_files = ":empty",
     linker_files = ":empty",
     objcopy_files = ":empty",

tools/cross-toolchain/cc_toolchain_config_windows.bzl.tpl

@@ -37,6 +37,7 @@ def _impl(ctx):
     action_configs = []
 
     install = "/usr/x86_64-w64-mingw32/"
+    gcc_libpath = "/usr/lib/gcc/x86_64-w64-mingw32/8.3-win32/"
     bin_prefix = "/usr/bin/x86_64-w64-mingw32-"
 
 
@@ -158,7 +159,10 @@ def _impl(ctx):
     ]
 
     cxx_builtin_include_directories = [
-        install +"include"
+        install +"include",
+        gcc_libpath +"include",
+        gcc_libpath +"include-fixed",
+        "/usr/share/mingw-w64/include/"
     ]
 
     artifact_name_patterns = [