Run pkg-config only when needed

Author: TheAssassin

include-or-build-gtest.cmake

@@ -9,11 +9,11 @@ set(prefix __ld_gtest)
 # 1.11.0 introduced various matchers that can be used with EXPECT_THAT (e.g., ThrowsMessage)
 set(required_version 1.11.0)
 
-pkg_check_modules(${prefix} gtest>=${required_version} IMPORTED_TARGET)
-
 if(TARGET gtest)
     __cmake_scripts_log("target gtest found, not setting up again")
 else()
+    pkg_check_modules(${prefix} gtest>=${required_version} IMPORTED_TARGET)
+
     if(${prefix}_FOUND)
         __cmake_scripts_log("Using system gtest")
         add_library(gtest ALIAS PkgConfig::${prefix})