fix useless getopt.h check (litespeedtech#424)

* link fix when using lsquic in a cpp project * Update CMakeLists.txt * Fix getopt.h error when not needed Co-authored-by: MBellahcene <moussa.bellahcene@4d.com>

Author: M-BELLAHCENE

CMakeLists.txt

@@ -231,8 +231,8 @@ IF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  link_directories( /usr/local/lib )
 ENDIF()
 
-IF (CMAKE_SYSTEM_NAME STREQUAL Windows)
- FIND_PATH(GETOPT_INCLUDE_DIR NAMES getopt.h AND LSQUIC_TESTS AND LSQUIC_BIN)
+IF (CMAKE_SYSTEM_NAME STREQUAL Windows AND LSQUIC_TESTS AND LSQUIC_BIN)
+ FIND_PATH(GETOPT_INCLUDE_DIR NAMES getopt.h)
  IF (GETOPT_INCLUDE_DIR)
  INCLUDE_DIRECTORIES(${GETOPT_INCLUDE_DIR})
  ELSE()