Build fixdep under debian/build and clean it up properly

Mattia Dongili noted that it's currently built under tools/build
(upstream bug).  Build it under the current output directory
(which means we build it multiple times) and clean all copies.

debian/build/Makefile

@@ -19,3 +19,6 @@ all-recursive: all-local
 
 clean-local::
 	rm -rf generated include out
+# fixdep may be built in several places since we don't set the output directory
+# consistently (XXX)
+	find -name fixdep -delete

debian/changelog

@@ -3,6 +3,7 @@ linux-tools (4.4-2) UNRELEASED; urgency=medium
   * linux-perf: Include version number in strace groups installation directory
     (Closes: #813080)
   * [alpha,sh4] Attempt to fix build failures
+  * Build fixdep under debian/build and clean it up properly
 
  -- Ben Hutchings <ben@decadent.org.uk>  Thu, 18 Feb 2016 21:46:41 +0000
 

debian/patches/series

@@ -22,3 +22,4 @@ perf-tools-fix-unused-variables-x86_-32-64-_regoffse.patch
 perf-remove-wrong-semicolon-in-while-loop.patch
 revert-perf-tools-x86-build-perf-on-older-user-space.patch
 perf-tools-fix-bpf-feature-check.patch
+tools-stop-building-fixdep-in-source.patch

debian/patches/tools-stop-building-fixdep-in-source.patch

@@ -0,0 +1,20 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Fri, 19 Feb 2016 01:14:05 +0000
+Subject: tools: Stop building fixdep in the source directory
+
+Use the proper target, $(OUTPUT)fixdep, not fixdep.
+
+Reported-by: Mattia Dongili <malattia@linux.it>
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+--- a/tools/build/Makefile.include
++++ b/tools/build/Makefile.include
+@@ -4,7 +4,7 @@ ifdef CROSS_COMPILE
+ fixdep:
+ else
+ fixdep:
+-	$(Q)$(MAKE) -C $(srctree)/tools/build fixdep
++	$(Q)$(MAKE) -C $(srctree)/tools/build $(OUTPUT)fixdep
+ endif
+ 
+ .PHONY: fixdep