builtins.exp: Add for mingw targets linker option --allow-multiple-definition.

	* gcc.c-torture/execute/builtins/builtins.exp: Add for mingw
	targets linker option --allow-multiple-definition.

From-SVN: r196545

gcc/testsuite/ChangeLog

 2013-03-08  Kai Tietz  <ktietz@redhat.com>
 
+	* gcc.c-torture/execute/builtins/builtins.exp: Add for mingw
+	targets linker option --allow-multiple-definition.
+
 	* gcc.dg/pr14092-1.c: Mark intptr_t typedef to use extension.
 	* gcc.dg/pr24683.c: Avoid warning about casting constant string.
 	* gcc.dg/pr52549.c: Add LLP64 case.

gcc/testsuite/gcc.c-torture/execute/builtins/builtins.exp

@@ -42,7 +42,8 @@ if [istarget "powerpc-*-darwin*"] {
    lappend additional_flags "-Wl,-multiply_defined,suppress"
 }
 if { [istarget *-*-eabi*]
-     || [istarget *-*-elf] } {
+     || [istarget *-*-elf]
+     || [istarget *-*-mingw*] } {
    lappend additional_flags "-Wl,--allow-multiple-definition"
 }