Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1500 2f5784b3-3f2a-0410-8824-cb99058d5e15
Fix style issue. Forgot the 80 column page width in the previous patch.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1501 2f5784b3-3f2a-0410-8824-cb99058d5e15