[Minor] Fix pthreads linking

CMakeLists.txt

@@ -120,6 +120,8 @@ INCLUDE(OSDep)
 
 # Now find libraries and headers
 LIST(APPEND RSPAMD_REQUIRED_LIBRARIES "m")
+LIST(APPEND RSPAMD_REQUIRED_LIBRARIES "pthread")
+
 IF(ENABLE_LUAJIT MATCHES "ON")
 	ProcessPackage(LIBLUAJIT LIBRARY	"luajit"
 										"luajit-2.1"
@@ -177,7 +179,6 @@ IF(ENABLE_JEMALLOC MATCHES "ON" AND NOT SANITIZE)
 	ProcessPackage(JEMALLOC LIBRARY jemalloc_pic jemalloc INCLUDE jemalloc.h INCLUDE_SUFFIXES include/jemalloc
 		ROOT ${JEMALLOC_ROOT_DIR})
 	SET(WITH_JEMALLOC "1")
-	LIST(APPEND RSPAMD_REQUIRED_LIBRARIES "-lpthread")
 ENDIF()
 
 IF(ENABLE_LIBUNWIND MATCHES "ON")
@@ -433,7 +434,6 @@ TRY_RUN(_CAN_RUN _CAN_COMPILE
 	CMAKE_FLAGS CMAKE_C_FLAGS="-pthread")
 IF(_CAN_RUN EQUAL 1)
 	SET(HAVE_PTHREAD_PROCESS_SHARED 1 CACHE INTERNAL "")
-	LIST(APPEND RSPAMD_REQUIRED_LIBRARIES "-lpthread")
 ENDIF(_CAN_RUN EQUAL 1)
 IF(HAVE_PTHREAD_PROCESS_SHARED)
 	MESSAGE(STATUS "pthread_mutexattr_setpshared is supported")