Fixed removal of links on Unix-like OSes, updated tests against future regressions

Author: nickclark2016

src/host/os_rmdir.c

@@ -4,6 +4,7 @@
  * \author Copyright (c) 2002-2013 Jess Perkins and the Premake project
  */
 
+#include <sys/stat.h>
 #include <stdlib.h>
 #include "premake.h"
 
@@ -23,7 +24,12 @@ int os_rmdir(lua_State* L)
 
 	z = RemoveDirectoryW(wide_path);
 #else
-	z = (0 == rmdir(path));
+	struct stat buf;
+	if (lstat(path, &buf) == 0 && S_ISLNK(buf.st_mode)) {
+		z = (0 == unlink(path));
+	} else {
+		z = (0 == rmdir(path));
+	}
 #endif
 
 	if (!z)

tests/base/test_os.lua

@@ -70,12 +70,14 @@
 		test.istrue(os.linkdir("folder/subfolder", "folder/subfolder2"))
 		test.istrue(os.islink("folder/subfolder2"))
 		os.rmdir("folder/subfolder2")
+		test.isfalse(os.islink("folder/subfolder2"))
 	end
 
 	function suite.linkfile()
 		test.istrue(os.linkfile("folder/ok.lua", "folder/ok2.lua"))
 		test.istrue(os.islink("folder/ok2.lua"))
 		os.remove("folder/ok2.lua")
+		test.isfalse(os.islink("folder/ok2.lua"))
 	end