CI: install pkg-config alongside freetds for systemLibrary pkg-config resolution

Author: vkuttyp

.github/workflows/swift.yml

@@ -19,7 +19,7 @@ jobs:
         run: sudo xcode-select -s /Applications/Xcode_15.4.app
 
       - name: Install FreeTDS
-        run: brew install freetds
+        run: brew install pkg-config freetds
 
       - name: Build
         run: swift build -v

Sources/CFreeTDS/module.modulemap

@@ -1,4 +1,7 @@
-module CFreeTDS [system] {
-    header "include/CFreeTDS.h"
-    export *
-}
+#ifndef CFREETDS_H
+#define CFREETDS_H
+
+#include <sybfront.h>
+#include <sybdb.h>
+
+#endif