Add a test that -fPIC is applied

src/test/run-make/fpic/Makefile

@@ -0,0 +1,9 @@
+-include ../tools.mk
+
+# Test for #39529. 
+# `-z text` causes ld to error if there are any non-PIC sections
+
+all:
+ifndef IS_WINDOWS
+	$(RUSTC) hello.rs -C link-args=-Wl,-z,text
+endif

src/test/run-make/fpic/hello.rs

@@ -0,0 +1,11 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() { }