dtc: bump to 1.4.6, add debuginfo, switch to tar.xz. (#2782)

FWIW, this release passes all tests on all available arches:

********** TEST SUMMARY
*     Total testcases:	1676
*                PASS:	1676
*                FAIL:	0
*   Bad configuration:	0
* Strange test result:	0
**********

sys-apps/dtc/dtc-1.4.6.recipe

@@ -5,8 +5,8 @@ HOMEPAGE="https://git.kernel.org/cgit/utils/dtc/dtc.git"
 COPYRIGHT="2005 David Gibson, IBM Corporation"
 LICENSE="GNU GPL v2"
 REVISION="1"
-SOURCE_URI="https://www.kernel.org/pub/software/utils/dtc/dtc-$portVersion.tar.gz"
-CHECKSUM_SHA256="a5dee36ac9ddd000e18ffecdbd5e6d83c5d552af21a644fe4e820480daa9f36b"
+SOURCE_URI="https://www.kernel.org/pub/software/utils/dtc/dtc-$portVersion.tar.xz"
+CHECKSUM_SHA256="382302bfcc3c40734be80ac620983971d911ec4cde798f551873f3eb008c7b7e"
 PATCHES="dtc-$portVersion.patchset"
 
 ARCHITECTURES="!x86_gcc2 x86 x86_64"
@@ -51,6 +51,15 @@ BUILD_PREREQUIRES="
 	cmd:make
 	"
 
+defineDebugInfoPackage dtc$secondaryArchSuffix \
+	"$commandBinDir"/convert-dtsv0 \
+	"$commandBinDir"/dtc \
+	"$commandBinDir"/fdtdump \
+	"$commandBinDir"/fdtget \
+	"$commandBinDir"/fdtoverlay \
+	"$commandBinDir"/fdtput \
+	"$libDir"/libfdt-$portVersion.so
+
 BUILD()
 {
 	make PREFIX=$prefix $jobArgs NO_PYTHON=TRUE

sys-apps/dtc/patches/dtc-1.4.6.patchset

@@ -5,7 +5,7 @@ Subject: Apply patch from 1.3.0.
 
 
 diff --git a/Makefile b/Makefile
-index e1e138a..aafda0a 100644
+index 9ba8121..7364de3 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -49,6 +49,15 @@ SHAREDLIB_CFLAGS  = -fPIC