Replace FindBoost_add_-lpthread_#563479.diff patch with a better version.

Steal a new patch from upstream BTS. What is more, make some minor changes to
it to make it apply and work with current FindBoost.

debian/changelog

@@ -6,6 +6,8 @@ cmake (2.8.11~rc1-1) UNRELEASED; urgency=low
   * Drop XMLrpc support. It has been disabled upstream for a while now.
     (Closes: #687326)
   * Bump Standards-Version to 3.9.4: no changes needed.
+  * Replace FindBoost_add_-lpthread_#563479.diff patch with a better version
+    from upstream BTS and make it apply to current FindBoost.
 
  -- Modestas Vainius <modax@debian.org>  Fri, 05 Oct 2012 21:00:55 +0300
 

debian/patches/FindBoost_add_-lpthread_#563479.diff

@@ -1,23 +1,44 @@
 Subject: Add -lpthread when using Boost::Thread.
-Author: Kai Wasserbäch <debian@carbon-project.org>
+Author: Philip Lowman <debian@carbon-project.org>
-Origin: vendor
+Author: Modestas Vainius <modax@debian.org>
-Last-Update: 2011-01-16
+Origin: other, http://public.kitware.com/Bug/file_download.php?file_id=3929&type=bug
+Last-Update: 2013-03-16
 Bug: http://cmake.org/Bug/view.php?id=10692
 Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=563479
 Forwarded: http://cmake.org/Bug/file_download.php?file_id=3629&type=bug
----
- Modules/FindBoost.cmake |    3 +++
- 1 file changed, 3 insertions(+)
 
 --- a/Modules/FindBoost.cmake
 +++ b/Modules/FindBoost.cmake
-@@ -1184,6 +1184,9 @@ set(Boost_ERROR_REASON)
+@@ -409,6 +409,22 @@ function(_Boost_GUESS_COMPILER_PREFIX _r
-             message (STATUS "  ${COMPONENT}")
+   set(${_ret} ${_boost_COMPILER} PARENT_SCOPE)
-           endif(NOT Boost_FIND_QUIETLY)
+ endfunction()
-           set(Boost_LIBRARIES ${Boost_LIBRARIES} ${Boost_${UPPERCOMPONENT}_LIBRARY})
+ 
-+          if(${UPPERCOMPONENT} STREQUAL "THREAD" AND UNIX)
++function(_Boost_consider_adding_pthreads _outvar)
-+            set(Boost_LIBRARIES ${Boost_LIBRARIES} pthread)
++  # On Unix platforms (excluding cygwin) add pthreads to Boost_LIBRARIES
-+          endif(${UPPERCOMPONENT} STREQUAL "THREAD" AND UNIX)
++  # if the user is searching for the boost-thread component.
-         endif( Boost_${UPPERCOMPONENT}_FOUND )
++  if(UNIX AND NOT CYGWIN)
-       endforeach(COMPONENT)
++    list(FIND Boost_FIND_COMPONENTS thread _using_boost_thread)
-   else()
++    if(_using_boost_thread GREATER -1)
++      find_library(BOOST_THREAD_LIBRARY NAMES pthread
++                   DOC "The threading library used by boost-thread"
++      )
++      if(BOOST_THREAD_LIBRARY)
++        set(${_outvar} ${ARGN} ${BOOST_THREAD_LIBRARY} PARENT_SCOPE)
++      endif()
++    endif()
++  endif()
++endfunction()
++
+ #
+ # End functions/macros
+ #
+@@ -1091,6 +1107,9 @@ if(Boost_FOUND)
+       list(APPEND Boost_LIBRARIES ${Boost_${UPPERCOMPONENT}_LIBRARY})
+     endif()
+   endforeach()
++
++  # Add pthread library on UNIX if thread component was found
++  _Boost_consider_adding_pthreads(Boost_LIBRARIES ${Boost_LIBRARIES})
+ else()
+   if(Boost_FIND_REQUIRED)
+     message(SEND_ERROR "Unable to find the requested Boost libraries.\n${Boost_ERROR_REASON}")