debug/ltrace: pump ltrace to version 0.7.3

pump ltrace to version 0.7.3
backport a patch from Peter Wu to silence warnings/errors in ltrace

Signed-off-by: '"Peter Wu" <lekensteyn@gmail.com>'
Signed-off-by: '"Daniel Zimmermann" <netzimme@gmail.com>'
[yann.morin.1998@free.fr: remove superfluous empty lines]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <8349c35b506aa79c4e69.1392845765@haus-VirtualBox>
Patchwork-Id: 322017

diff -dur strace-4.5.16.orig/system.c strace-4.5.16/system.c

--- strace-4.5.16.orig/system.c	2007-01-17 00:22:36.000000000 +0100

+++ strace-4.5.16/system.c	2007-07-14 19:28:41.000000000 +0200

@@ -1612,7 +1612,9 @@

 	{ CTL_KERN, "CTL_KERN" },

 	{ CTL_VM, "CTL_VM" },

 	{ CTL_NET, "CTL_NET" },

+#ifdef CTL_PROC

 	{ CTL_PROC, "CTL_PROC" },

+#endif

 	{ CTL_FS, "CTL_FS" },

 	{ CTL_DEBUG, "CTL_DEBUG" },

 	{ CTL_DEV, "CTL_DEV" },