cmake: prefer system libraries

externals/find-modules/Findinih.cmake

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2022 Alexandre Bouvier <contact@amb.tf>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+find_package(PkgConfig QUIET)
+if (PKG_CONFIG_FOUND)
+    pkg_search_module(INIREADER QUIET IMPORTED_TARGET GLOBAL INIReader)
+    if (INIREADER_FOUND)
+        add_library(inih::INIReader ALIAS PkgConfig::INIREADER)
+    endif()
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(inih
+    REQUIRED_VARS INIREADER_LINK_LIBRARIES
+    VERSION_VAR INIREADER_VERSION
+)