Resolve unused variable warning

Author: XuehaiPan

Python/sysmodule.c

@@ -75,17 +75,13 @@ module sys
 #include "clinic/sysmodule.c.h"
 
 
-PyDoc_STRVAR(IncomingSysAbiflagsChange_msg,
-"sys.abiflags will be set to a meaningful value on all platforms "
-"in Python 3.16 instead of absent.\n\n"
-"Please consider using `warnings.simplefilter()` with the "
-"`warnings.catch_warnings()` context manager.\n"
-"Or update the code with `if sys.platform.startswith('win')` condition."
-);
-
-#define WarnIncomingSysAbiflagsChange()     \
-    PyErr_WarnEx(PyExc_DeprecationWarning,  \
-        IncomingSysAbiflagsChange_msg,      \
+#define WarnIncomingSysAbiflagsChange()                                            \
+    PyErr_WarnEx(PyExc_DeprecationWarning,                                         \
+        "sys.abiflags will be set to a meaningful value on all platforms "         \
+        "in Python 3.16 instead of absent.\n\n"                                    \
+        "Please consider using `warnings.simplefilter()` with the "                \
+        "`warnings.catch_warnings()` context manager.\n"                           \
+        "Or update the code with `if sys.platform.startswith('win')` condition.",  \
         /*stack_level=*/1)