rewrite prune-link-args as a ui test

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -182,7 +182,6 @@ run-make/pretty-print-with-dep-file/Makefile
 run-make/print-calling-conventions/Makefile
 run-make/print-target-list/Makefile
 run-make/profile/Makefile
-run-make/prune-link-args/Makefile
 run-make/raw-dylib-alt-calling-convention/Makefile
 run-make/raw-dylib-c/Makefile
 run-make/raw-dylib-cross-compilation/Makefile

tests/run-make/prune-link-args/Makefile

@@ -0,0 +1,13 @@
+// Passing link-args with an unexpected space
+// could result in the flag being parsed and receiving
+// an unexpected, empty linker argument. This test
+// ensures successful compilation even when a space is
+// present.
+// See https://github.com/rust-lang/rust/pull/10749
+
+//@ check-pass
+
+//@ compile-flags: -C link-args="lc "
+// Notice the space at the end, which emulates the output of pkg-config
+
+fn main() {}