SDL: ci: install pkg-config on Macos runner

SDL Commits
#1 
From d3b7308ee7bcda38e93e45d39fa0cc63e3d1e207 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Thu, 16 Feb 2023 20:56:51 +0100
Subject: [PATCH] ci: install pkg-config on Macos runner

---
 .github/workflows/main.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 204570feae8a..5db7d404d889 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -63,6 +63,7 @@ jobs:
       run: |
         brew install \
           ninja \
+          pkg-config \
           llvm
     - uses: actions/checkout@v3
     - name: Check that versioning is consistent