[OB PATCH] Disable nested function tests for clang

[Pedro Alves]

On 4/20/20 3:49 PM, Gary Benson via Gdb-patches wrote:
> Clang does not support nested functions, and there are no plans to
> change this.  This commit disables the three nested function tests
> when using clang.
> 
> gdb/testsuite/ChangeLog:
> 
> 	* gdb.base/nested-subp1.exp: Disable test when using clang.
> 	* gdb.base/nested-subp2.exp: Likewise.
> 	* gdb.base/nested-subp3.exp: Likewise.

Please use the support_nested_function_tests procedure instead.

Thanks,
Pedro Alves