patch 8.0.0625: shellescape() always escapes a newline

Problem:    shellescape() always escapes a newline, which does not work with
            some shells. (Harm te Hennepe)
Solution:   Only escape a newline when the "special" argument is non-zero.
            (Christian Brabandt, closes #1590)
diff --git a/src/version.c b/src/version.c
index c066c81..0280ca8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    625,
+/**/
     624,
 /**/
     623,