[PATCH] Revert portion of Change 34200

The attached patch reverts a portion of change 34200 that causes tests to fail.
For example:

> PERL_CORE=1 ./perl.exe -Ilib lib/ExtUtils/ParseXS/t/basic.t
1..10
# Running under perl version 5.011000 for cygwin
# Current time local: Fri Aug 22 13:06:29 2008
# Current time GMT:   Fri Aug 22 17:06:29 2008
# Using Test.pm version 1.25
ok 1
ok 2
ok 3
ok 4
ok 5
XSTest.o:XSTest.c:(.text+0x15): undefined reference to `_Perl_Gthr_key_ptr'
XSTest.o:XSTest.c:(.text+0x25): undefined reference to `_Perl_Istack_sp_ptr'
XSTest.o:XSTest.c:(.text+0x2e): undefined reference to `_Perl_Gthr_key_ptr'
XSTest.o:XSTest.c:(.text+0x3e): undefined reference to
`_Perl_Imarkstack_ptr_ptr'
XSTest.o:XSTest.c:(.text+0x4e): undefined reference to `_Perl_Gthr_key_ptr'
...

• [PATCH] Revert portion of change 34200 by Jerry D. Hedden
• [PATCH] Revert portion of Change 34200 by Jerry D. Hedden
• Re: [PATCH] Revert portion of Change 34200 by Reini Urban