Bump rewriter from `26f5c84` to `20d3ab6` #4557

	name: Test Generated C

	on:
	push:
	pull_request:
	schedule:
	- cron: '0 0 1 * *'

	jobs:
	test-c:

	runs-on: ubuntu-latest

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	steps:
	- uses: actions/checkout@v4
	with:
	submodules: recursive
	- name: install gcc
	run: \|
	sudo sed -i 's/azure\.//' /etc/apt/sources.list
	sudo apt-get -o Acquire::Retries=30 update -q
	sudo apt-get -o Acquire::Retries=30 install -y --allow-unauthenticated \
	g++ libssl-dev \
	ninja-build libunwind-dev cmake
	#sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7
	- name: GCC Problem Matcher
	uses: ammaraskar/[email protected]
	- name: Set up Go
	uses: actions/setup-go@v4
	id: go
	- name: make only-test-c-files CC=gcc
	run: make only-test-c-files CC=gcc EXTERNAL_DEPENDENCIES=1
	- name: make only-test-bedrock2-files CC=gcc
	run: make only-test-bedrock2-files CC=gcc EXTERNAL_DEPENDENCIES=1
	- name: BoringSSL C test
	run: EXTRA_CFLAGS="" etc/ci/test-fiat-c-boringssl.sh fiat-c/src
	- name: BoringSSL bedrock2 test
	run: EXTRA_CFLAGS="$(make bedrock2-extra-cflags SKIP_INCLUDE=1 2>/dev/null)" etc/ci/test-fiat-c-boringssl.sh fiat-bedrock2/src

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