main/musl: update to alpine version 1.1.16-r21

- incorporate unreleased upstream bugfixes from august to present:
  - fix OOB reads in memmem implementations
  - fix undefined behaviour in memset
  - fix memory leak in clearenv
  - fix unicode processing bugs
  - fix signal masking issue with pthread_create
  - fix glob descent with GLOB_PERIOD

- implement fopencookie(3)

1 files changed, 39 insertions, 0 deletions

diff --git a/main/musl/0063-fix-undefined-behavior-in-memset-due-to-missing-sequ.patch b/main/musl/0063-fix-undefined-behavior-in-memset-due-to-missing-sequ.patch
new file mode 100644
index 0000000000..e247b7f404
--- /dev/null
+++ b/main/musl/0063-fix-undefined-behavior-in-memset-due-to-missing-sequ.patch
@@ -0,0 +1,39 @@
+From 9d4c902c42b3fda368d7ea64bb9575c46228fa7f Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Tue, 29 Aug 2017 19:53:50 -0400
+Subject: [PATCH 11/30] fix undefined behavior in memset due to missing
+ sequence points
+
+patch by Pascal Cuoq.
+---
+ src/string/memset.c | 12 ++++++++----
+ 1 file changed, 8 insertions(+), 4 deletions(-)
+
+diff --git a/src/string/memset.c b/src/string/memset.c
+index f438b073..5613a148 100644
+--- a/src/string/memset.c
++++ b/src/string/memset.c
+@@ -11,12 +11,16 @@ void *memset(void *dest, int c, size_t n)
+ 	 * offsets are well-defined and in the dest region. */
+ 
+ 	if (!n) return dest;
+-	s[0] = s[n-1] = c;
++	s[0] = c;
++	s[n-1] = c;
+ 	if (n <= 2) return dest;
+-	s[1] = s[n-2] = c;
+-	s[2] = s[n-3] = c;
++	s[1] = c;
++	s[2] = c;
++	s[n-2] = c;
++	s[n-3] = c;
+ 	if (n <= 6) return dest;
+-	s[3] = s[n-4] = c;
++	s[3] = c;
++	s[n-4] = c;
+ 	if (n <= 8) return dest;
+ 
+ 	/* Advance pointer to align it at a 4-byte boundary,
+-- 
+2.13.3
+