package/strace: fix build for mips

Upstream changes in mips specific code of the last release broke build
for that target. Add a patch that restores build.

Fixes:
http://autobuild.buildroot.net/results/858/8585e75df6462b6d07476a81982e88ec81655c8b/
http://autobuild.buildroot.net/results/b2f/b2f24976ddda1adc9b9ba3d9bfb7167721814f78/
http://autobuild.buildroot.net/results/031/0313245fe555e0c0890c3f475bf6586db23535ed/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/strace/0002-Fix-build-for-mips-targets.patch

@@ -0,0 +1,68 @@
+From 8150854b5dd030a47f601931daf827ca33bc9bd9 Mon Sep 17 00:00:00 2001
+From: Baruch Siach <baruch@tkos.co.il>
+Date: Tue, 8 Jan 2019 19:52:21 +0200
+Subject: [PATCH] Fix build for mips targets
+
+Commit 917c2ccf3a67 ("Refactor stack pointers") removed
+linux/mips/arch_regs.h that defines mips_REG_* macros and struct
+mips_regs. These symbols are referenced in mips code. Restore
+arch_regs.h to fix the build failure:
+
+syscall.c: In function 'decode_syscall_subcall':
+syscall.c:370:7: error: 'mips_REG_SP' undeclared (first use in this function)
+       mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
+	   ^~~~~~~~~~~
+
+[ baruch: drop the Makefile.in hunk to avoid autoreconf ]
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status:
+https://lists.strace.io/pipermail/strace-devel/2019-January/008598.html
+
+ linux/mips/arch_regs.c |  4 +---
+ linux/mips/arch_regs.h | 18 ++++++++++++++++++
+ 3 files changed, 20 insertions(+), 3 deletions(-)
+ create mode 100644 linux/mips/arch_regs.h
+
+diff --git a/linux/mips/arch_regs.c b/linux/mips/arch_regs.c
+index 0874e31efea4..3ed841ee7c1a 100644
+--- a/linux/mips/arch_regs.c
++++ b/linux/mips/arch_regs.c
+@@ -5,9 +5,7 @@
+  * SPDX-License-Identifier: LGPL-2.1-or-later
+  */
+ 
+-static struct {
+-	uint64_t uregs[38];
+-} mips_regs;
++struct mips_regs mips_regs; /* not static */
+ 
+ #define REG_V0 2
+ #define REG_A0 4
+diff --git a/linux/mips/arch_regs.h b/linux/mips/arch_regs.h
+new file mode 100644
+index 000000000000..6372badce646
+--- /dev/null
++++ b/linux/mips/arch_regs.h
+@@ -0,0 +1,18 @@
++struct mips_regs {
++	uint64_t uregs[38];
++};
++
++extern struct mips_regs mips_regs;
++
++#define REG_V0 2
++#define REG_A0 4
++
++#define mips_REG_V0 mips_regs.uregs[REG_V0]
++#define mips_REG_A0 mips_regs.uregs[REG_A0 + 0]
++#define mips_REG_A1 mips_regs.uregs[REG_A0 + 1]
++#define mips_REG_A2 mips_regs.uregs[REG_A0 + 2]
++#define mips_REG_A3 mips_regs.uregs[REG_A0 + 3]
++#define mips_REG_A4 mips_regs.uregs[REG_A0 + 4]
++#define mips_REG_A5 mips_regs.uregs[REG_A0 + 5]
++#define mips_REG_SP mips_regs.uregs[29]
++#define mips_REG_EPC mips_regs.uregs[34]
+-- 
+2.20.1
+