Remove getenv from SystemNative_GetTimeZoneData

Author: SingleAccretion

src/native/libs/System.Native/pal_datetime_time_zone_data.c

@@ -72,29 +72,18 @@ extern const char *g_dataIndex[];
 const char* SystemNative_GetTimeZoneData(const char* name, int* length)
 {
 #ifdef TZ_DATA_ENABLED
-    static int s_disabledViaConfig;
-    if (s_disabledViaConfig == 0)
-    {
-        char* isInvariantTimeZone = getenv("DOTNET_SYSTEM_TIMEZONE_INVARIANT");
-        bool isDisabled = strcmp(isInvariantTimeZone, "true") == 0 || strcmp(isInvariantTimeZone, "1") == 0;
-        s_disabledViaConfig = isDisabled ? 1 : -1;
-    }
+    // Small size and speed optimization: skip comparing the prefix.
+    static const char TZ_PREFIX[] = "/usr/share/zoneinfo/";
+    static const size_t TZ_PREFIX_LENGTH = STRING_LENGTH(TZ_PREFIX);
 
-    if (s_disabledViaConfig != 1)
+    // TODO: use a binary search here. The index is ~500 entries long.
+    assert(strncmp(TZ_PREFIX, name, TZ_PREFIX_LENGTH) == 0);
+    for (size_t i = 0; i < ARRAY_SIZE(g_nameIndex); i++)
     {
-        // Small size and speed optimization: skip comparing the prefix.
-        static const char TZ_PREFIX[] = "/usr/share/zoneinfo/";
-        static const size_t TZ_PREFIX_LENGTH = STRING_LENGTH(TZ_PREFIX);
-
-        // TODO: use a binary search here. The index is ~500 entries long.
-        assert(strncmp(TZ_PREFIX, name, TZ_PREFIX_LENGTH) == 0);
-        for (size_t i = 0; i < ARRAY_SIZE(g_nameIndex); i++)
+        if (strcmp(name + TZ_PREFIX_LENGTH, g_nameIndex[i]) == 0)
         {
-            if (strcmp(name + TZ_PREFIX_LENGTH, g_nameIndex[i]) == 0)
-            {
-                *length = (int)(g_dataIndex[i + 1] - g_dataIndex[i]);
-                return g_dataIndex[i];
-            }
+            *length = (int)(g_dataIndex[i + 1] - g_dataIndex[i]);
+            return g_dataIndex[i];
         }
     }
 #endif // TZ_DATA_ENABLED