patch 8.1.0601: a few compiler warnings

Problem:    A few compiler warnings.
Solution:   Add type casts. (Mike Williams)
diff --git a/src/GvimExt/gvimext.cpp b/src/GvimExt/gvimext.cpp
index 30b2ddd..b9d9d91 100644
--- a/src/GvimExt/gvimext.cpp
+++ b/src/GvimExt/gvimext.cpp
@@ -1084,7 +1084,6 @@
 	CloseHandle(pi.hProcess);
 	CloseHandle(pi.hThread);
     }
-theend:
     free(cmdStrW);
 
     return NOERROR;
diff --git a/src/memline.c b/src/memline.c
index 0eb31c3..eaa3b65 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -3146,7 +3146,7 @@
     colnr_T len = -1;
 
     if (line != NULL)
-	len = STRLEN(line);
+	len = (colnr_T)STRLEN(line);
     return ml_replace_len(lnum, line, len, copy);
 }
 
@@ -3196,14 +3196,14 @@
 	    size_t textproplen = curbuf->b_ml.ml_line_len - oldtextlen;
 
 	    // Need to copy over text properties, stored after the text.
-	    newline = alloc(len + 1 + textproplen);
+	    newline = alloc(len + 1 + (int)textproplen);
 	    if (newline != NULL)
 	    {
 		mch_memmove(newline, line, len + 1);
 		mch_memmove(newline + len + 1, curbuf->b_ml.ml_line_ptr + oldtextlen, textproplen);
 		vim_free(line);
 		line = newline;
-		len += textproplen;
+		len += (colnr_T)textproplen;
 	    }
 	}
     }
diff --git a/src/textprop.c b/src/textprop.c
index 3e0207d..05df2e1 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -301,7 +301,7 @@
     }
     if (proplen > 0)
 	*props = text + textlen;
-    return proplen / sizeof(textprop_T);
+    return (int)(proplen / sizeof(textprop_T));
 }
 
     static proptype_T *
@@ -393,7 +393,7 @@
 		buf->b_ml.ml_line_ptr = newtext;
 		buf->b_ml.ml_flags |= ML_LINE_DIRTY;
 	    }
-	    buf->b_ml.ml_line_len = len;
+	    buf->b_ml.ml_line_len = (int)len;
 	}
     }
     redraw_buf_later(buf, NOT_VALID);
@@ -423,8 +423,8 @@
     {
 	char_u	    *text = ml_get_buf(buf, lnum, FALSE);
 	size_t	    textlen = STRLEN(text) + 1;
-	int	    count = (buf->b_ml.ml_line_len - textlen)
-							  / sizeof(textprop_T);
+	int	    count = (int)((buf->b_ml.ml_line_len - textlen)
+							 / sizeof(textprop_T));
 	int	    i;
 	textprop_T  prop;
 	proptype_T  *pt;
@@ -607,7 +607,7 @@
 	    EMSG2(_("E969: Property type %s already defined"), name);
 	    return;
 	}
-	prop = (proptype_T *)alloc_clear(sizeof(proptype_T) + STRLEN(name));
+	prop = (proptype_T *)alloc_clear((int)(sizeof(proptype_T) + STRLEN(name)));
 	if (prop == NULL)
 	    return;
 	STRCPY(prop->pt_name, name);
diff --git a/src/version.c b/src/version.c
index a485b28..5db1001 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    601,
+/**/
     600,
 /**/
     599,