Kill ABI compatibility bits, we don't need them.
Fixes build failures on non-ELF (blackfin) targets.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura pcre-8.32.orig/pcrecpp.cc pcre-8.32/pcrecpp.cc
--- pcre-8.32.orig/pcrecpp.cc	2012-12-28 08:32:10.193847937 -0300
+++ pcre-8.32/pcrecpp.cc	2012-12-28 08:32:26.924376180 -0300
@@ -58,22 +58,6 @@
 // Special object that stands-in for no argument
 Arg RE::no_arg((void*)NULL);
 
-// This is for ABI compatibility with old versions of pcre (pre-7.6),
-// which defined a global no_arg variable instead of putting it in the
-// RE class.  This works on GCC >= 3, at least.  It definitely works
-// for ELF, but may not for other object formats (Mach-O, for
-// instance, does not support aliases.)  We could probably have a more
-// inclusive test if we ever needed it.  (Note that not only the
-// __attribute__ syntax, but also __USER_LABEL_PREFIX__, are
-// gnu-specific.)
-#if defined(__GNUC__) && __GNUC__ >= 3 && defined(__ELF__)
-# define ULP_AS_STRING(x)            ULP_AS_STRING_INTERNAL(x)
-# define ULP_AS_STRING_INTERNAL(x)   #x
-# define USER_LABEL_PREFIX_STR       ULP_AS_STRING(__USER_LABEL_PREFIX__)
-extern Arg no_arg
-  __attribute__((alias(USER_LABEL_PREFIX_STR "_ZN7pcrecpp2RE6no_argE")));
-#endif
-
 // If a regular expression has no error, its error_ field points here
 static const string empty_string;