crt: Don't print a leading '+' for format strings like "%+u"

For unsigned print formats like %u, %o and %x, don't print a leading
plus. It wasn't printed for %+o and %+x, but %+u did print one.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-crt/stdio/mingw_pformat.c

diff --git a/mingw-w64-crt/stdio/mingw_pformat.c b/mingw-w64-crt/stdio/mingw_pformat.c
index a68d0f6..b1c139b 100644
--- a/mingw-w64-crt/stdio/mingw_pformat.c
+++ b/mingw-w64-crt/stdio/mingw_pformat.c
@@ -2492,6 +2492,7 @@
 	    /*
 	     * Unsigned integer values; octal, decimal or hexadecimal format...
 	     */
+	    stream.flags &= ~PFORMAT_POSITIVE;
 #if __ENABLE_PRINTF128
         argval.__pformat_u128_t.t128.digits[1] = 0LL; /* no sign extend needed */
 	    if( length == PFORMAT_LENGTH_LLONG128 )