Compile external tools with optimizations.

contrib/blake2/CMakeLists.txt

 cmake_minimum_required(VERSION 2.6)
 
 set(BLAKE_SRC blake2b-ref.c)
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-	set(CMAKE_C_FLAGS "-O3")
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
 endif ()
 add_library(blake2 STATIC "${BLAKE_SRC}")

contrib/hiredis/CMakeLists.txt

                   net.c
                   sds.c)
 
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
+endif ()
 ADD_LIBRARY(hiredis STATIC ${LIBHIREDISSRC})
 IF(CMAKE_COMPILER_IS_GNUCC)
 SET_TARGET_PROPERTIES(hiredis PROPERTIES COMPILE_FLAGS "-fno-strict-aliasing")

contrib/http-parser/CMakeLists.txt

 SET(HTTPSRC            http_parser.c)
 
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
+endif ()
 ADD_LIBRARY(rspamd-http-parser ${LINK_TYPE} ${HTTPSRC})
 SET_TARGET_PROPERTIES(rspamd-http-parser PROPERTIES VERSION ${RSPAMD_VERSION})
 SET_TARGET_PROPERTIES(rspamd-http-parser PROPERTIES COMPILE_FLAGS "-DRSPAMD_LIB")

contrib/libottery/CMakeLists.txt

                          ottery_cpuinfo.c
                          ottery_entropy.c
                          ottery_global.c)
-
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
+endif ()
 ADD_LIBRARY(ottery STATIC ${OTTERYSRC})  

contrib/siphash

-Subproject commit a2008b797d528768f849f7b7ab2ec4cde66cc1c2
+Subproject commit 5c2607c17fdc195d84bb63c0c9c3b6500f516960

contrib/xxhash/CMakeLists.txt

 SET(XXHASHSRC xxhash.c)
 
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
+endif ()
 ADD_LIBRARY(xxhash STATIC ${XXHASHSRC})