Comment out the set -u (nounset) shell option in test-driver,

which errors out when encountering unset variables.

During "gmake test" the pcregrep binary is never called because it

causes a problem in the pcregrep libtool wrapper for

an unset variable $libtool_install_magic.

Problem is not seen when running "gmake check" directly from

command line. Solaris-specific patch not appropriate for upstream.

--- pcre-8.37-orig/test-driver 2015-04-28 04:17:22.000000000 -0700

+++ pcre-8.37/test-driver 2015-06-19 11:43:59.905679371 -0700

@@ -29,7 +29,7 @@ scriptversion=2013-07-13.22; # UTC

# Make unconditional expansion of undefined variables an error. This

# helps a lot in preventing typo-related bugs.

-set -u

+# set -u

usage_error ()

{