simplify expression

CMakeLists.txt

@@ -80,9 +80,9 @@ endif()
 
 set(ZLIB_PC ${CMAKE_CURRENT_BINARY_DIR}/zlib.pc)
 configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib.pc.cmakein
-		${ZLIB_PC} @ONLY)
-configure_file(	${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
-		${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
+                ${ZLIB_PC} @ONLY)
+configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zconf.h.cmakein
+                ${CMAKE_CURRENT_BINARY_DIR}/zconf.h @ONLY)
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR})
 
 
@@ -156,7 +156,7 @@ target_include_directories(zlibstatic PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
 
 set(ZLIB_BUILD_SHARED_LIB)
-if((NOT CMAKE_C_COMPILER_ID STREQUAL "OpenWatcom") OR CMAKE_SYSTEM_NAME STREQUAL "Windows" OR CMAKE_SYSTEM_NAME STREQUAL "OS2" OR CMAKE_SYSTEM_NAME STREQUAL "Windows3x")
+if(NOT(CMAKE_C_COMPILER_ID STREQUAL "OpenWatcom") OR (CMAKE_SYSTEM_NAME MATCHES "Windows|OS2|Windows3x"))
     set(ZLIB_BUILD_SHARED_LIB 1)
     add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
     target_include_directories(zlib PUBLIC