cmake HAVE_PCRE_PCRE_H examples

shadowsocks/shadowsocks-libev cmake/configure.cmake :57 

check_include_files(pcre/pcre.h HAVE_PCRE_PCRE_H)

ShadowsocksR-Live/shadowsocksr-native cmake/configure.cmake :58 

check_include_files ( "pcre/pcre.h" HAVE_PCRE_PCRE_H )