convert fpic to ui test

tests/ui/errors/pic-linker.rs

@@ -0,0 +1,12 @@
+// `-z text` caused the linker to error if there were any non-position-independent
+// code (PIC) sections. This test checks that this no longer happens.
+// See https://github.com/rust-lang/rust/pull/39803
+
+//@ ignore-windows
+//@ ignore-macos
+//@ ignore-cross-compile
+
+//@ compile-flags -Clink-args=-Wl,-z,text
+//@ run-pass
+
+fn main() {}