kernel32: Restore C locale for LC_CTYPE category.

In tr_TR.UTF-8 locale tolower('I') != 'i' (this is not a bug in glibc,
tolower('I') is suppossed to return dotless i that is 2-byte long).
Because of that strcasemp("i", "I") returns that the strings are
different.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/kernel32/locale.c

@@ -4226,6 +4226,7 @@ void LOCALE_Init(void)
            mac_cptable->info.codepage, unix_cp );
 
     setlocale(LC_NUMERIC, "C");  /* FIXME: oleaut32 depends on this */
+    setlocale(LC_CTYPE, "C"); /* Fixes issues when tr_TR.UTF-8 locale is used */
 }
 
 static HANDLE NLS_RegOpenKey(HANDLE hRootKey, LPCWSTR szKeyName)