Fix up missing WITHOUT_DOCS, WITHOUT_CLIENT options

--- pcre/CMakeLists.txt.orig	2016-03-24 09:12:11 UTC
+++ pcre/CMakeLists.txt
@@ -508,6 +508,8 @@ IF(PCRE_SHOW_REPORT)
   MESSAGE(STATUS "")
 ENDIF(PCRE_SHOW_REPORT)
 
+IF(FALSE)
 INSTALL(FILES ${CMAKE_BINARY_DIR}/pcre/pcre.h DESTINATION ${INSTALL_INCLUDEDIR}/private COMPONENT Development)
+ENDIF()
 
 # end CMakeLists.txt