[newlib-cygwin] ctype: Fix integer type for caseconv_entry::delta

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d8d18c3e80b029449240de8b3d970c03674e9617

commit d8d18c3e80b029449240de8b3d970c03674e9617
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Fri Jul 27 09:16:53 2018 +0200

    ctype: Fix integer type for caseconv_entry::delta
    
    The commit 46ba1675c457324b0eeef4670a09101ef3f34c50 accidently changed a
    bit-field from signed to unsigned.  The caseconv_entry::delta must be a
    signed integer, see also "newlib/libc/ctype/caseconv.t".
    
    Unfortunately, a standard GCC/Newlib build is done without
    -Wsign-conversion.  Using this warning option would have helped to avoid
    this bug:
    
    caseconv.t:2:22: warning: unsigned conversion from 'int' to 'unsigned int:17' changes value from '-32' to '131040' [-Wsign-conversion]
       {0x0061, 25, TOUP, -32},
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/ctype/towctrans_l.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/ctype/towctrans_l.c b/newlib/libc/ctype/towctrans_l.c
index 42085ac..7b8a23c 100644
--- a/newlib/libc/ctype/towctrans_l.c
+++ b/newlib/libc/ctype/towctrans_l.c
@@ -39,7 +39,7 @@ static struct caseconv_entry {
   uint_least32_t first: 21;
   uint_least8_t diff: 8;
   uint_least8_t mode: 2;
-  uint_least32_t delta: 17;
+  int_least32_t delta: 17;
 } __attribute__ ((packed))
 caseconv_table [] = {
 #include "caseconv.t"