ci: don't install pkg-config explicitly

.github/workflows/cleanup.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-set -e
-
-if pkg=$(brew list | grep -E "pkg-config"); then
-    brew uninstall "$pkg" || true
-fi

.github/workflows/doc.yml

@@ -43,7 +43,6 @@ jobs:
         run: |
           set -e
           set -x
-          bash .github/workflows/cleanup.sh
           source doc/_readme/scripts/install_macos.sh
 
       - name: Install dependencies on Ubuntu

.github/workflows/go.yml

@@ -41,9 +41,8 @@ jobs:
       - name: Install dependencies
         if: startsWith(matrix.os, 'macos')
         run: |
-          bash .github/workflows/cleanup.sh
           brew update
-          brew install llvm@${{matrix.llvm}} pkg-config bdw-gc openssl libffi
+          brew install llvm@${{matrix.llvm}} bdw-gc openssl libffi
           echo "$(brew --prefix llvm@${{matrix.llvm}})/bin" >> $GITHUB_PATH
           echo "PKG_CONFIG_PATH=/opt/homebrew/opt/libffi/lib/pkgconfig" >> $GITHUB_ENV
 

README.md

@@ -358,7 +358,7 @@ Follow these steps to generate the `llgo` command (its usage is the same as the
 
 ```sh
 brew update
-brew install llvm@18 pkg-config bdw-gc openssl cjson
+brew install llvm@18 bdw-gc openssl cjson
 brew install python@3.12 # optional
 go install -v github.com/goplus/llgo/cmd/llgo@latest
 ```

doc/_readme/scripts/install_macos.sh

@@ -1,5 +1,5 @@
 # shellcheck disable=all
 brew update
-brew install llvm@18 pkg-config bdw-gc openssl cjson
+brew install llvm@18 bdw-gc openssl cjson
 brew install python@3.12 # optional
 go install -v github.com/goplus/llgo/cmd/llgo@latest