Prefixing patches with four-digit numbers.

Signed-off-by: Daniel Baumann <daniel@debian.org>

debian/patches/0001-build.patch

@@ -0,0 +1,19 @@
+Author: Daniel Baumann <daniel.baumann@progress-technologies.net>
+Description: Avoid overwriting build-environment.
+
+diff -Naurp lunzip.orig/configure lunzip/configure
+--- lunzip.orig/configure
++++ lunzip/configure
+@@ -23,9 +23,9 @@ datarootdir='$(prefix)/share'
+ infodir='$(datarootdir)/info'
+ mandir='$(datarootdir)/man'
+ CC=gcc
+-CPPFLAGS=
+-CFLAGS='-Wall -W -O2'
+-LDFLAGS=
++#CPPFLAGS=
++#CFLAGS='-Wall -W -O2'
++#LDFLAGS=
+ 
+ # checking whether we are using GNU C.
+ if [ ! -x /bin/gcc ] &&