Parametrize debian/changelog

* configure.ac (CHANGELOGTIME): Rename to RPM_CHANGELOGTIME.
(DEB_CHANGELOGTIME): New variable.
(AC_CONFIG_FILES): Add debian/changelog.
* strace.spec.in: Rename CHANGELOGTIME to RPM_CHANGELOGTIME.
* debian/changelog: Rename to ...
* debian/changelog.in: ... this file.  Add parametrized entry.
* debian/.gitignore: New file.

configure.ac

@@ -40,8 +40,10 @@ AM_INIT_AUTOMAKE([foreign nostdinc dist-xz no-dist-gzip silent-rules parallel-te
 AM_MAINTAINER_MODE
 AC_CANONICAL_HOST
 
-CHANGELOGTIME="$(LC_TIME=C date '+%a %b %d %Y')"
-AC_SUBST(CHANGELOGTIME)
+RPM_CHANGELOGTIME="$(LC_TIME=C date '+%a %b %d %Y')"
+AC_SUBST(RPM_CHANGELOGTIME)
+DEB_CHANGELOGTIME="$(LC_TIME=C date -R)"
+AC_SUBST(DEB_CHANGELOGTIME)
 
 AC_PROG_CC
 AC_PROG_CPP
@@ -786,5 +788,6 @@ AC_CONFIG_FILES([Makefile
 		 tests/Makefile
 		 tests-m32/Makefile
 		 tests-mx32/Makefile
-		 strace.spec])
+		 strace.spec
+		 debian/changelog])
 AC_OUTPUT

debian/.gitignore

@@ -0,0 +1 @@
+/changelog

debian/changelog.in

@@ -1,3 +1,9 @@
+strace (@PACKAGE_VERSION@-1) experimental; urgency=low
+
+  * @PACKAGE_STRING@ snapshot.
+
+ -- Strace <@PACKAGE_BUGREPORT@>  @DEB_CHANGELOGTIME@
+
 strace (4.12-3) unstable; urgency=medium
 
   * Fix up 32/64-bit test output in strace -S test to fix i386 build

strace.spec.in

@@ -103,7 +103,7 @@ echo 'END OF TEST SUITE INFORMATION'
 %endif
 
 %changelog
-* @CHANGELOGTIME@ @PACKAGE_BUGREPORT@ - @PACKAGE_VERSION@-%release
+* @RPM_CHANGELOGTIME@ @PACKAGE_BUGREPORT@ - @PACKAGE_VERSION@-1
 - @PACKAGE_STRING@ snapshot.
 
 * Tue May 31 2016 Dmitry V. Levin <ldv@altlinux.org> - 4.12-1