Add a check before using -fno-define-target-os-macros (#125)

* Only enable -fno-define-target-os-macros for APPLE architecture

* fixup! Add a check before using `-fno-define-target-os-macros`

Author: sunshaoce

MultiSource/Applications/ClamAV/CMakeLists.txt

@@ -178,9 +178,15 @@ if(TARGET_OS STREQUAL "Linux")
   find_package(Intl REQUIRED)
   target_link_libraries(clamscan ${Intl_LIBRARIES})
 endif()
-# zlib fails to build with correctly defined target OS macros.
-# (https://github.com/madler/zlib/pull/895)
-# Disable the compiler extension to workaround the build failure until a zlib
-# source update with the fix.
-target_compile_options(clamscan PRIVATE -fno-define-target-os-macros)
+
+include(CheckCCompilerFlag)
+check_c_compiler_flag(-fno-define-target-os-macros
+                      COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+if (COMPILER_HAS_NO_DEFINE_TARGET_OS_MACROS)
+  # zlib fails to build with correctly defined target OS macros.
+  # (https://github.com/madler/zlib/pull/895)
+  # Disable the compiler extension to workaround the build failure until a zlib
+  # source update with the fix.
+  target_compile_options(clamscan PRIVATE -fno-define-target-os-macros)
+endif()
 llvm_test_data(clamscan ${INPUT} dbdir)