complibs/ppl: fix 0.11-0.11.2 to compile with --disable-shared

PPL 0.11 (through 0.11.2) had a small bug where it still tried to build
and test its Java interface even when shared libraries are disabled.
Since that's exactly what ct-ng does, it explodes.

This is the patch from the PPL authors (see final link below).

More information can be found in these messages/threads:

Anthony's initial report and analysis with Yann:
http://www.cygwin.com/ml/crossgcc/2011-05/msg00046.html

Ron Flory hit the same problem:
http://www.cygwin.com/ml/crossgcc/2011-05/msg00054.html

Anthony's report to the ppl-devel list:
http://www.cs.unipr.it/pipermail/ppl-devel/2011-May/017450.html

Roberto's reply with a link to the fix in the PPL git repo:
http://www.cs.unipr.it/pipermail/ppl-devel/2011-May/017455.html

Signed-Off-By: Anthony Foiani <anthony.foiani@gmail.com>
(transplanted from 139b85d70b623e51f7585e7c64ecb8c6a6cf4567)

 --- libc/nptl/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h    2006/10/29 21:48:06     1.6

 +++ libc/nptl/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h    2007/03/13 21:28:03     1.7

 @@ -55,6 +55,7 @@

  	bne	a3, SYSCALL_ERROR_LABEL;			\

  __LABEL($pseudo_ret)						\

  	.subsection 2;						\

 +	cfi_startproc;						\

  __LABEL($pseudo_cancel)						\

  	subq	sp, 64, sp;					\

  	cfi_def_cfa_offset(64);					\

 @@ -90,12 +91,13 @@

  	cfi_def_cfa_offset(0);					\

  __LABEL($syscall_error)						\

  	SYSCALL_ERROR_HANDLER;					\

 +	cfi_endproc;						\

  	.previous

  # undef PSEUDO_END

  # define PSEUDO_END(sym)					\

 -	.subsection 2;						\

  	cfi_endproc;						\

 +	.subsection 2;						\

  	.size sym, .-sym

  # define SAVE_ARGS_0	/* Nothing.  */