Revert "[3.7] bpo-34589: Add -X coerce_c_locale option; C locale coercion off by default (GH-9379)" (GH-9416)

This reverts commit 144f1e2c6f4a24bd288c045986842c65cc289684.
diff --git a/Include/pystate.h b/Include/pystate.h
index c2ccb20..f16ffb8 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -41,6 +41,8 @@
     int show_alloc_count;   /* -X showalloccount */
     int dump_refs;          /* PYTHONDUMPREFS */
     int malloc_stats;       /* PYTHONMALLOCSTATS */
+    int coerce_c_locale;    /* PYTHONCOERCECLOCALE, -1 means unknown */
+    int coerce_c_locale_warn; /* PYTHONCOERCECLOCALE=warn */
     int utf8_mode;          /* PYTHONUTF8, -X utf8; -1 means unknown */
 
     wchar_t *program_name;  /* Program name, see also Py_GetProgramName() */
@@ -72,8 +74,6 @@
 
     /* Private fields */
     int _disable_importlib; /* Needed by freeze_importlib */
-    int _coerce_c_locale;    /* PYTHONCOERCECLOCALE, -1 means unknown */
-    int _coerce_c_locale_warn; /* PYTHONCOERCECLOCALE=warn */
 } _PyCoreConfig;
 
 #define _PyCoreConfig_INIT \
@@ -81,8 +81,7 @@
         .install_signal_handlers = -1, \
         .ignore_environment = -1, \
         .use_hash_seed = -1, \
-        ._coerce_c_locale = 0, \
-        ._coerce_c_locale_warn = 0, \
+        .coerce_c_locale = -1, \
         .faulthandler = -1, \
         .tracemalloc = -1, \
         .utf8_mode = -1, \