Revert "tests: Test extern'd globals on MacOS with the Apple Archiver"

This reverts commit d285be763f.

This is part of #10628 and needs to be reverted, as it breaks other
things.

See https://github.com/mesonbuild/meson/pull/10628#issuecomment-1230560772

test cases/osx/9 global variable ar/libfile.c

@@ -1,9 +0,0 @@
-// Source: https://lists.gnu.org/archive/html/libtool/2002-07/msg00025.html
-
-#include <stdio.h>
-
-extern int l2;
-void l1(void)
-{
-  printf("l1 %d\n", l2);
-}

test cases/osx/9 global variable ar/libfile2.c

@@ -1,7 +0,0 @@
-// Source: https://lists.gnu.org/archive/html/libtool/2002-07/msg00025.html
-
-int l2;
-void l2_func(void)
-{
-  l2 = 77;
-}

test cases/osx/9 global variable ar/meson.build

@@ -1,6 +0,0 @@
-# Source: https://lists.gnu.org/archive/html/libtool/2002-07/msg00025.html
-
-project('global variable test', 'c')
-
-lib = static_library('mylib', 'libfile.c', 'libfile2.c')
-test('global variable', executable('prog', 'prog.c', link_with: lib))

test cases/osx/9 global variable ar/nativefile.ini

@@ -1,2 +0,0 @@
-[binaries]
-ar = 'ar'

test cases/osx/9 global variable ar/prog.c

@@ -1,7 +0,0 @@
-// Source: https://lists.gnu.org/archive/html/libtool/2002-07/msg00025.html
-
-extern void l1(void);
-int main(void)
-{
-  l1();
-}