refactor: work around sign conversion warning

Author: JohelEGP

include/cpp2util.h

@@ -1526,9 +1526,7 @@ struct args_t : std::vector<std::string_view>
 inline auto make_args(int argc, char const* const* argv) -> args_t
 {
     auto ret = args_t{argc, argv};
-    for (auto i = 0; i < argc; ++i) {
-        ret[i] = std::string_view{argv[i]};
-    }
+    std::copy(argv, argv + argc, ret.data());
     return ret;
 }
 

regression-tests/test-results/clang-16/clang-version.output

@@ -0,0 +1,4 @@
+clang version 16.0.6 (https://github.com/llvm/llvm-project.git 7cbf1a2591520c2491aa35339f227775f4d3adf6)
+Target: x86_64-pc-linux-gnu
+Thread model: posix
+InstalledDir: /home/johel/root/clang-16/bin

regression-tests/test-results/clang-16/pure2-bugfix-for-empty-index.cpp.execution

@@ -0,0 +1 @@
+Hello Fred with UFCS!