Fix CVE-2017-16844:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16844
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876511

Patch copied from Debian procmail package 3.22-26:

http://http.debian.net/debian/pool/main/p/procmail/procmail_3.22-26.debian.tar.xz

From: Santiago Vila <sanvila@debian.org>
Subject: Fix heap-based buffer overflow in loadbuf()
Bug-Debian: http://bugs.debian.org/876511
X-Debian-version: 3.22-26

--- a/src/formisc.c
+++ b/src/formisc.c
@@ -103,7 +103,7 @@
 }
 							    /* append to buf */
 void loadbuf(text,len)const char*const text;const size_t len;
-{ if(buffilled+len>buflen)			  /* buf can't hold the text */
+{ while(buffilled+len>buflen)			  /* buf can't hold the text */
      buf=realloc(buf,buflen+=Bsize);
   tmemmove(buf+buffilled,text,len);buffilled+=len;
 }
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<tr><td><span title='2019-01-24 23:07:10 +0100'>2019-01-24</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=c28bf42f2adce1a37bfbc4e18387910e476c166d'>gnu: axoloti-patcher: Use INVOKE.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-patcher)[arguments]: Use INVOKE and
unconditionally return #T from build phase.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-01-24 23:06:33 +0100'>2019-01-24</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=1ae04a2acc814a45510e235e1968b8836c4ffb9b'>gnu: axoloti-runtime: Use INVOKE.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-runtime)[arguments]: Use INVOKE and return
  #T from build phases unconditionally.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-12-16 09:01:57 +0100'>2017-12-16</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=341bddb31542d03bef35b1234e6e9466be337798'>gnu: axoloti-runtime: Update ChibiOS URL.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-runtime)[inputs]: Update URL for ChibiOS
sources.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-10-17 17:32:20 +0200'>2017-10-17</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=94b55ace14c09802298b5d2dc4e60dbad3ef6982'>gnu: axoloti-runtime: Update home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm (axoloti-runtime)[home-page]: Use redirection
target URL.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-10-17 16:49:20 +0200'>2017-10-17</span></td><td><a href='/guix/commit/gnu/packages/axoloti.scm?id=d991b0566433b0ff78dd92165430da2f40fe721d'>gnu: Add Axoloti.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/axoloti.scm: New file.
* gnu/packages/patches/libusb-for-axoloti.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add patch.
(GNU_SYSTEM_MODULES): Add module.
</span></span></td><td>Ricardo Wurmus</td></tr>