add patch script for yosys-config

to replace baked-in paths with relative ones

.github/scripts/patch_yosys_config.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# Patches any yosys-config scripts to replace the fixed build path with a relative one
+# Inspired by https://github.com/YosysHQ/oss-cad-suite-build/blob/f41b9ae59c6afe323b41a069da48c3835f0846b0/scripts/package-linux.sh#L248
+
+search_path="${1:-.}"
+
+for yosysconfig in $(find "$search_path" -type f -name yosys-config); do
+	echo "Fixing paths in" "$yosysconfig"
+
+	patch -ns "$yosysconfig" << EOT
+1a2
+> install_prefix="\$(readlink -f "\$(dirname "\${BASH_SOURCE[0]}")/..")"
+EOT
+
+	# Get current fixed prefix that is already in the file
+	old_prefix="$(readlink -f "$(dirname "$yosysconfig")/..")"
+
+	sed -i "s,\"$old_prefix,\"\$install_prefix,g" "$yosysconfig"
+	sed -i "s,'$old_prefix,\"\$install_prefix\"',g" "$yosysconfig"
+	sed -i "s,$old_prefix,\"\$install_prefix\",g" "$yosysconfig"
+
+done

.github/workflows/main.yml

@@ -161,6 +161,7 @@ jobs:
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
           make -rR -j$(nproc) -Oline -f build_binaries.mk ${BUILD_BINARIES_ARGS} \
               install-surelog install-yosys install-plugin
+          ./.github/scripts/patch_yosys_config.sh out
           # By default actions/upload-artifact@v2 do not preserve file permissions
           # tar directory to workaround this issue
           # See https://github.com/actions/upload-artifact/issues/38