Fix syntax

Author: kongy

libcxx/src/filesystem/operations.cpp

@@ -40,9 +40,15 @@
 #include <time.h>
 
 // since Linux 4.5 and FreeBSD 13, but the Linux libc wrapper is only provided by glibc >= 2.27 and musl
-#if (defined(__linux__) &&                                                                                             \
-     ((defined(_LIBCPP_GLIBC_PREREQ) && _LIBCPP_GLIBC_PREREQ(2, 27)) || _LIBCPP_HAS_MUSL_LIBC)) ||                     \
-    defined(__FreeBSD__)
+#if defined(__linux__)
+#  if defined(_LIBCPP_GLIBC_PREREQ)
+#    if _LIBCPP_GLIBC_PREREQ(2, 27)
+#      define _LIBCPP_FILESYSTEM_USE_COPY_FILE_RANGE
+#    endif
+#  elif _LIBCPP_HAS_MUSL_LIBC
+#    define _LIBCPP_FILESYSTEM_USE_COPY_FILE_RANGE
+#  endif
+#elif defined(__FreeBSD__)
 #  define _LIBCPP_FILESYSTEM_USE_COPY_FILE_RANGE
 #endif
 #if __has_include(<sys/sendfile.h>)