CMake: Use boost_{zlib,bzip2} when statically linking Boost

The official Windows binaries for Boost come with these renamed versions
of the zlib and bzip2 libraries.

CMakeLists.txt

@@ -149,19 +149,23 @@ include_directories(SYSTEM ${Boost_INCLUDE_DIR})
 
 has_static_libs(Boost Boost_LIBRARIES)
 if(Boost_HAS_STATIC_LIBS)
-	
-	use_static_libs(ZLIB)
-	find_package(ZLIB REQUIRED)
-	use_static_libs_restore()
-	check_link_library(ZLIB ZLIB_LIBRARIES)
-	list(APPEND LIBRARIES ${ZLIB_LIBRARIES})
-	
-	use_static_libs(BZip2)
-	find_package(BZip2 REQUIRED)
-	use_static_libs_restore()
-	check_link_library(BZip2 BZIP2_LIBRARIES)
-	list(APPEND LIBRARIES ${BZIP2_LIBRARIES})
-	
+	foreach(Lib IN ITEMS ZLIB BZip2)
+		string(TOUPPER ${Lib} LIB)
+		string(TOLOWER ${Lib} lib)
+		use_static_libs(${Lib})
+		if(WIN32)
+			find_package(Boost COMPONENTS ${lib} QUIET)
+		endif()
+		if(Boost_${LIB}_FOUND)
+			message (STATUS "Found boost_${lib}")
+			set(${LIB}_LIBRARIES ${Boost_${LIB}_LIBRARY})
+		else()
+			find_package(${Lib} REQUIRED)
+		endif()
+		use_static_libs_restore()
+		check_link_library(${Lib} ${LIB}_LIBRARIES)
+		list(APPEND LIBRARIES ${${LIB}_LIBRARIES})
+	endforeach()
 endif()
 
 set(INNOEXTRACT_HAVE_ICONV 0)