Revert "* check is pcre.h available in cmake"

This reverts commit 8d5ba0ce79.

CMakeLists.txt

@@ -4,7 +4,6 @@ set(VERSION 0.3)
 project(${CNAME} C)
 cmake_minimum_required(VERSION 2.6)
 
-include(CheckIncludeFiles)
 include(CTest)
 
 option(WITH_CLIENT    "Simple client for configuring daemon" ON)
@@ -38,12 +37,6 @@ if (WITH_HARDENING)
   add_definitions("-D_FORTIFY_SOURCE=2")
 endif ()
 
-check_include_files("pcre.h" HAS_PCRE)
-if (${WITH_PCRE} STREQUAL "ON" AND NOT ${HAS_PCRE})
-  set(WITH_PCRE "OFF")
-  message(WARNING "pcre headers not found, support disabled")
-endif ()
-
 message(STATUS "Compiler   : ${CMAKE_C_COMPILER} (${CMAKE_C_COMPILER_ID} ${CMAKE_C_COMPILER_VERSION})")
 message(STATUS "- CFLAGS   : ${CMAKE_C_FLAGS}")
 message(STATUS "Paths:")