buildsys: reorganize Makefile

* build in versioned subdirectory
* add 'deb' make target
* drop fakeroot from dpkg-buildpackage invocation

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>

Makefile

@@ -1,20 +1,28 @@
 include /usr/share/dpkg/pkg-info.mk
 include /usr/share/dpkg/architecture.mk
 
-PACKAHE=libxdgmime
+PACKAGE=libxdgmime
 
 DEB = libxdgmime-perl_${DEB_VERSION_UPSTREAM_REVISION}_${DEB_BUILD_ARCH}.deb
+BUILDSRC=${PACKAGE}-${DEB_VERSION_UPSTREAM}
 
 OPKGNAME=Xdgmime
 UPSTREAM=xdgmime-source/src
 
-${DEB}: ${OPKGNAME}/Xdgmime.xs
-	-rm -rf build
-	cp -a ${OPKGNAME} build
-	cp -a ${UPSTREAM}/xdgmime*.[ch] build/
-	perl -MDevel::PPPort -e 'Devel::PPPort::WriteFile("build/ppport.h");'
-	cp -a debian build
-	cd build; dpkg-buildpackage -b -us -uc -rfakeroot
+all: ${DEB}
+
+.PHONY: ${BUILDSRC}
+${BUILDSRC}:
+	-rm -rf ${BUILDSRC}
+	cp -a ${OPKGNAME} ${BUILDSRC}
+	cp -a ${UPSTREAM}/xdgmime*.[ch] ${BUILDSRC}/
+	perl -MDevel::PPPort -e 'Devel::PPPort::WriteFile("${BUILDSRC}/ppport.h");'
+	cp -a debian ${BUILDSRC}
+
+.PHONY: deb
+deb: ${DEB}
+${DEB}: ${OPKGNAME}/Xdgmime.xs ${BUILDSRC}
+	cd ${BUILDSRC}; dpkg-buildpackage -b -us -uc
 	lintian ${DEB}
 
 .PHONY: upload
@@ -22,7 +30,7 @@ upload: ${DEB}
 	tar cf - ${DEB} | ssh -X repoman@repo.proxmox.com -- upload --product pmg --dist stretch
 
 
-CLEANFILES = *~ debian/*~ *.deb build libxdgmime-perl_*
+CLEANFILES = *~ debian/*~ *.deb ${BUILDSRC} libxdgmime-perl_*
 
 .PHONY: clean
 clean: