patch 8.1.0093: non-MS-Windows: Cannot interrupt gdb when program is running

Problem:    non-MS-Windows: Cannot interrupt gdb when program is running.
Solution:   Only use debugbreak() on MS-Windows.
diff --git a/src/version.c b/src/version.c
index 80a3c2c..b821423 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    93,
+/**/
     92,
 /**/
     91,