strace: Tweak ptest disk space management

If the test is successful, remove the log and exp files. This stops strace
using around 600MB of disk space and running our ptest images out of space.

(From OE-Core rev: ae94bffc6991efd6a6a74b2c129d3743b5fd1cd3)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/strace/strace/ptest-spacesave.patch

@@ -0,0 +1,19 @@
+If the test is successful, remove the log and exp files. This stops strace
+using around 600MB of disk space and running our ptest images out of space.
+
+RP 2019/5/29
+
+Upstream-Status: Inappropriate [specific to OE image space issues]
+
+Index: strace-4.26/tests/gen_tests.sh
+===================================================================
+--- strace-4.26.orig/tests/gen_tests.sh
++++ strace-4.26/tests/gen_tests.sh
+@@ -62,6 +62,7 @@ while read -r name arg0 args; do {
+ 		$hdr
+ 		. "\${srcdir=.}/init.sh"
+ 		run_strace_match_diff $arg0 $args
++		rm -rf log exp
+ 		EOF
+ 		;;
+ 

meta/recipes-devtools/strace/strace_4.26.bb

@@ -15,6 +15,7 @@ SRC_URI = "https://strace.io/files/${PV}/strace-${PV}.tar.xz \
            file://0001-caps-abbrev.awk-fix-gawk-s-path.patch \
            file://0001-tests-sigaction-Check-for-mips-and-alpha-before-usin.patch \
            file://0001-mips-o32-fix-build.patch \
+           file://ptest-spacesave.patch \
            "
 SRC_URI[md5sum] = "daa51acc0c7c696221ec03cf0b30a7af"
 SRC_URI[sha256sum] = "7c4d2ffeef4f7d1cdc71062ca78d1130eb52f947c2fca82f59f6a1183bfa1e1c"