move define '_BUILD_STD_MODULE' to 'generate_libcxx_cppm_in.py'

Author: siradam7th

libcxx/modules/std.cppm.in

@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifdef _LIBCPP_ABI_VCRUNTIME
+#define _BUILD_STD_MODULE
+#endif
+
 // WARNING, this entire header is generated by
 // utils/generate_libcxx_cppm_in.py
 // DO NOT MODIFY!
@@ -51,9 +55,6 @@ module;
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#ifdef _LIBCPP_ABI_VCRUNTIME
-#define _BUILD_STD_MODULE
-#endif
 #include <ctime>
 #include <cuchar>
 #include <cwchar>

libcxx/utils/generate_libcxx_cppm_in.py

@@ -25,6 +25,10 @@ def write_file(module):
 //
 //===----------------------------------------------------------------------===//
 
+#ifdef _LIBCPP_ABI_VCRUNTIME
+#define _BUILD_STD_MODULE
+#endif
+
 // WARNING, this entire header is generated by
 // utils/generate_libcxx_cppm_in.py
 // DO NOT MODIFY!