FORTIFY_SOURCE: emphasize prevention in error messages.

FORTIFY_SOURCE prevents buffer overflows from occurring.
However, the error message often implies that we only
detect it, not prevent it.

Bring more clarity to the error messages by emphasizing
prevention over detection.

Change-Id: I5f3e1478673bdfc589e6cc4199fce8e52e197a24
diff --git a/libc/bionic/__strlcat_chk.cpp b/libc/bionic/__strlcat_chk.cpp
index 25c67ad..5f97093 100644
--- a/libc/bionic/__strlcat_chk.cpp
+++ b/libc/bionic/__strlcat_chk.cpp
@@ -46,7 +46,7 @@
               size_t supplied_size, size_t dest_len_from_compiler)
 {
     if (__predict_false(supplied_size > dest_len_from_compiler)) {
-        __fortify_chk_fail("strlcat buffer overflow", 0);
+        __fortify_chk_fail("strlcat buffer overflow prevented", 0);
     }
 
     return strlcat(dest, src, supplied_size);