CLI: infer --name based on first C source file or object

Previously, --name would only be inferred if there was exactly 1 C
source file or exactly 1 object. Now it will be inferred if there is at
least one of either.

Author: andrewrk

src/main.zig

@@ -1340,10 +1340,10 @@ fn buildOutputType(
         } else if (root_src_file) |file| {
             const basename = fs.path.basename(file);
             break :blk mem.split(basename, ".").next().?;
-        } else if (c_source_files.items.len == 1) {
+        } else if (c_source_files.items.len >= 1) {
             const basename = fs.path.basename(c_source_files.items[0].src_path);
             break :blk mem.split(basename, ".").next().?;
-        } else if (link_objects.items.len == 1) {
+        } else if (link_objects.items.len >= 1) {
             const basename = fs.path.basename(link_objects.items[0]);
             break :blk mem.split(basename, ".").next().?;
         } else if (emit_bin == .yes) {