debug/strace: pump version to 4.7 and 4.8

Pump version for strace to 4.7 and 4.8.
Add patch from strace mainline.


Work around conflict between <sys/ptrace.h> and <linux/ptrace.h>

Since glibc-2.18~39 <sys/ptrace.h> defines ptrace_peeksiginfo_args
which collides with <linux/ptrace.h>.

* configure.ac: Check for `struct ptrace_peeksiginfo_args' in
<sys/ptrace.h>.
* process.c: Work around potential conflict between <sys/ptrace.h>
and <linux/ptrace.h> by redefining ptrace_peeksiginfo_args.
* signal.c: Likewise.
* syscall.c: Likewise.
* util.c: Likewise.
http://sourceforge.net/p/strace/code/ci/0b4060f61f1bb101b5d8d084714b7d2feacdb199/

Signed-off-by: "Daniel Zimmermann" <netzimme@gmail.com>
Message-Id: <67b082cf1cdc8276eb4a.1385366288@haus-VirtualBox>
Patchwork-Id: 293842

 # D.U.M.A. - Detect Unintended Memory Access - Memory checker

 ## depends on ! BACKEND

 ## help D.U.M.A. - Detect Unintended Memory Access

 ## help A memory bound checker, with additional features.

 ## help Formerly known as Electric Fence.

 config DUMA_A

     bool

     prompt "Build a static library"

     default y

 config DUMA_SO

     bool

     prompt "Build a shared library"

     default y if SHARED_LIBS

 choice

     bool

     prompt "D.U.M.A. version"

 # Don't remove next line

 # CT_INSERT_VERSION_BELOW

 config DUMA_V_2_5_15

     bool

     prompt "2_5_15"

 endchoice

 config DUMA_VERSION

     string

 # Don't remove next line

 # CT_INSERT_VERSION_STRING_BELOW

     default "2_5_15" if DUMA_V_2_5_15