build: use patch rather than sed in native_cctools package

depends/packages/native_cctools.mk

@@ -4,6 +4,8 @@ $(package)_download_path=https://github.com/tpoechtrager/cctools-port/archive
 $(package)_file_name=$($(package)_version).tar.gz
 $(package)_sha256_hash=e51995a843533a3dac155dd0c71362dd471597a2d23f13dff194c6285362f875
 $(package)_build_subdir=cctools
+$(package)_patches=ld64_disable_threading.patch
+
 ifeq ($(strip $(FORCE_USE_SYSTEM_CLANG)),)
 $(package)_clang_version=8.0.0
 $(package)_clang_download_path=https://releases.llvm.org/$($(package)_clang_version)
@@ -78,7 +80,7 @@ endef
 define $(package)_preprocess_cmds
   CC=$($(package)_cc) CXX=$($(package)_cxx) INSTALLPREFIX=$($(package)_extract_dir) ./libtapi/build.sh && \
   CC=$($(package)_cc) CXX=$($(package)_cxx) INSTALLPREFIX=$($(package)_extract_dir) ./libtapi/install.sh && \
-  sed -i.old "/define HAVE_PTHREADS/d" $($(package)_build_subdir)/ld64/src/ld/InputFiles.h
+  patch -p1 < $($(package)_patch_dir)/ld64_disable_threading.patch
 endef
 
 define $(package)_config_cmds

depends/patches/native_cctools/ld64_disable_threading.patch

@@ -0,0 +1,26 @@
+commit 584668415039adeed073decee7e04de28248afd3
+Author: fanquake <fanquake@gmail.com>
+Date:   Tue Aug 18 01:20:24 2020 +0000
+
+    Disable threading to fix non-determinism
+
+    A bug in the file parser can cause dependencies to be calculated
+    differently based on which files have already been parsed. This is more
+    likely to occur on systems with more CPUs.
+
+    Just disable threading for now. There is no noticable slowdown.
+
+    See #9891.
+
+diff --git a/cctools/ld64/src/ld/InputFiles.h b/cctools/ld64/src/ld/InputFiles.h
+index ef9c756..90a70b6 100644
+--- a/cctools/ld64/src/ld/InputFiles.h
++++ b/cctools/ld64/src/ld/InputFiles.h
+@@ -25,7 +25,6 @@
+ #ifndef __INPUT_FILES_H__
+ #define __INPUT_FILES_H__
+
+-#define HAVE_PTHREADS 1
+
+ #include <stdlib.h>
+ #include <sys/types.h>