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CMake: Make _FORTIFY_SOURCE optional

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -109,6 +109,12 @@

                        OFF)

 add_feature_info(OPUS_STACK_PROTECTOR OPUS_STACK_PROTECTOR ${OPUS_STACK_PROTECTOR_HELP_STR})

+if(NOT MSVC AND NOT MINGW)

+    set(OPUS_FORTIFY_SOURCE_HELP_STR "add protection against buffer overflows.")

+    option(OPUS_FORTIFY_SOURCE ${OPUS_FORTIFY_SOURCE_HELP_STR} ON)

+    add_feature_info(OPUS_FORTIFY_SOURCE OPUS_FORTIFY_SOURCE ${OPUS_FORTIFY_SOURCE_HELP_STR})

+endif()

+

 if(OPUS_CPU_X86 OR OPUS_CPU_X64)

   set(OPUS_X86_MAY_HAVE_SSE_HELP_STR "does runtime check for SSE1 support.")

   cmake_dependent_option(OPUS_X86_MAY_HAVE_SSE

@@ -241,7 +247,7 @@

 target_link_libraries(opus PRIVATE ${OPUS_REQUIRED_LIBRARIES})

 target_compile_definitions(opus PRIVATE OPUS_BUILD ENABLE_HARDENING)

-if(NOT MSVC)

+if(OPUS_FORTIFY_SOURCE)

   target_compile_definitions(opus PRIVATE _FORTIFY_SOURCE=2)

 endif()