sendmail: stop doing -t unconditionally; makemime: generate 76 char base64 lines

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/mailutils/mail.c b/mailutils/mail.c
index f5260d9..199f644 100644
--- a/mailutils/mail.c
+++ b/mailutils/mail.c
@@ -119,7 +119,7 @@
 void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol)
 {
 	enum {
-		SRC_BUF_SIZE = 45,  /* This *MUST* be a multiple of 3 */
+		SRC_BUF_SIZE = 57,  /* This *MUST* be a multiple of 3 */
 		DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
 	};
 #define src_buf text