mrustc: Remove obsolete patches

--- a/rustc-1.29.0-src/src/librustc_llvm/lib.rs

--- b/rustc-1.29.0-src/src/librustc_llvm/lib.rs

@@ -23,6 +23,9 @@

 #![feature(link_args)]

 #![feature(static_nobundle)]

+// https://github.com/rust-lang/rust/issues/34486

+#[link(name = "ffi")] extern {}

+

 // See librustc_cratesio_shim/Cargo.toml for a comment explaining this.

 #[allow(unused_extern_crates)]

 extern crate rustc_cratesio_shim;

--- a/minicargo.mk

+++ b/minicargo.mk

@@ -116,11 +116,6 @@

 LLVM_CMAKE_OPTS += CMAKE_BUILD_TYPE=RelWithDebInfo

-$(LLVM_CONFIG): $(RUSTCSRC)build/Makefile

-	$Vcd $(RUSTCSRC)build && $(MAKE)

-$(RUSTCSRC)build/Makefile: $(RUSTCSRC)src/llvm/CMakeLists.txt

-	@mkdir -p $(RUSTCSRC)build

-	$Vcd $(RUSTCSRC)build && cmake $(addprefix -D , $(LLVM_CMAKE_OPTS)) ../src/llvm

 #

--- a/run_rustc/Makefile

+++ b/run_rustc/Makefile

@@ -103,7 +103,9 @@

 else

 	cp $(OUTDIR)build-rustc/release/rustc_binary $(BINDIR)rustc_binary

 endif

-	echo '#!/bin/sh\nd=$$(dirname $$0)\nLD_LIBRARY_PATH="$(abspath $(LIBDIR))" $$d/rustc_binary $$@' >$@

+	echo '#!$(shell which bash)' > $@

+	echo 'd=$$(dirname $$0)' >> $@

+	echo 'LD_LIBRARY_PATH="$(abspath $(LIBDIR))" $$d/rustc_binary $$@' >> $@

 	chmod +x $@

 $(BINDIR)hello_world: $(RUST_SRC)test/run-pass/hello.rs $(LIBDIR)libstd.rlib $(BINDIR)rustc

--- a/run_rustc/Makefile

+++ b/run_rustc/Makefile

@@ -79,14 +79,14 @@

 	@mkdir -p $(OUTDIR)build-std

 	@mkdir -p $(LIBDIR)

 	@echo [CARGO] $(RUST_SRC)libstd/Cargo.toml

-	$VCARGO_TARGET_DIR=$(OUTDIR)build-std RUSTC=$(BINDIR_S)rustc $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)libstd/Cargo.toml  -j 1 --release --features panic-unwind

+	$VCARGO_TARGET_DIR=$(OUTDIR)build-std RUSTC=$(BINDIR_S)rustc $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)libstd/Cargo.toml  -j $(NIX_BUILD_CORES) --release --features panic-unwind

 	$Vcp --remove-destination $(OUTDIR)build-std/release/deps/*.rlib $(LIBDIR)

 	$Vcp --remove-destination $(OUTDIR)build-std/release/deps/*.so $(LIBDIR)

 # libtest

 $(LIBDIR)libtest.rlib: $(BINDIR)rustc_m $(LIBDIR)libstd.rlib $(CARGO_HOME)config

 	@mkdir -p $(OUTDIR)build-test

 	@echo [CARGO] $(RUST_SRC)libtest/Cargo.toml

-	$VCARGO_TARGET_DIR=$(OUTDIR)build-test RUSTC=$(BINDIR)rustc_m $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)libtest/Cargo.toml  -j 1 --release

+	$VCARGO_TARGET_DIR=$(OUTDIR)build-test RUSTC=$(BINDIR)rustc_m $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)libtest/Cargo.toml  -j $(NIX_BUILD_CORES) --release

 	@mkdir -p $(LIBDIR)

 	$Vcp --remove-destination $(OUTDIR)build-test/release/deps/*.rlib $(LIBDIR)

 	$Vcp --remove-destination $(OUTDIR)build-test/release/deps/*.so $(LIBDIR)

@@ -95,7 +95,7 @@

 $(BINDIR)rustc: $(BINDIR)rustc_m $(BINDIR)cargo $(CARGO_HOME)config $(LIBDIR)libtest.rlib

 	@mkdir -p $(PREFIX)tmp

 	@echo [CARGO] $(RUST_SRC)rustc/Cargo.toml

-	$V$(RUSTC_ENV_VARS) TMPDIR=$(abspath $(PREFIX)tmp) CARGO_TARGET_DIR=$(OUTDIR)build-rustc RUSTC=$(BINDIR)rustc_m RUSTC_ERROR_METADATA_DST=$(abspath $(PREFIX)) $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)rustc/Cargo.toml --release -j 1

+	$V$(RUSTC_ENV_VARS) TMPDIR=$(abspath $(PREFIX)tmp) CARGO_TARGET_DIR=$(OUTDIR)build-rustc RUSTC=$(BINDIR)rustc_m RUSTC_ERROR_METADATA_DST=$(abspath $(PREFIX)) $(CARGO_ENV) $(BINDIR)cargo build --manifest-path $(RUST_SRC)rustc/Cargo.toml --release -j $(NIX_BUILD_CORES)

 	cp $(OUTDIR)build-rustc/release/deps/*.so $(LIBDIR)

 	cp $(OUTDIR)build-rustc/release/deps/*.rlib $(LIBDIR)

 ifeq ($(RUSTC_VERSION),1.19.0)