Don't run test on darwin

Author: alexcrichton

src/test/run-make/fpic/Makefile

@@ -1,9 +1,13 @@
 -include ../tools.mk
 
-# Test for #39529. 
+# Test for #39529.
 # `-z text` causes ld to error if there are any non-PIC sections
 
+ifeq ($(UNAME),Darwin)
+all:
+else ifdef IS_WINDOWS
+all:
+else
 all:
-ifndef IS_WINDOWS
 	$(RUSTC) hello.rs -C link-args=-Wl,-z,text
 endif