convert fpic to ui test

tests/run-make/fpic/Makefile

@@ -1,11 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-# ignore-windows
-# ignore-apple
-
-# Test for #39529.
-# `-z text` causes ld to error if there are any non-PIC sections
-
-all:
-	$(RUSTC) hello.rs -C link-args=-Wl,-z,text

tests/run-make/fpic/hello.rs

@@ -1 +0,0 @@
-fn main() { }

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() {}