Adding patch to avoid overwriting build environment.

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

debian/patches/0001-build.patch

@@ -0,0 +1,19 @@
+Author: Daniel Baumann <mail@daniel-baumann.ch>
+Description: Avoid overwriting build-environment.
+
+diff -Naurp zutils.orig/configure zutils/configure
+--- zutils.orig/configure
++++ zutils/configure
+@@ -23,9 +23,9 @@ datarootdir='$(prefix)/share'
+ infodir='$(datarootdir)/info'
+ mandir='$(datarootdir)/man'
+ CXX=g++
+-CPPFLAGS=
+-CXXFLAGS='-Wall -W -O2'
+-LDFLAGS=
++#CPPFLAGS=
++#CXXFLAGS='-Wall -W -O2'
++#LDFLAGS=
+ DIFF=diff
+ GREP=grep
+ 

debian/patches/series

@@ -0,0 +1 @@
+0001-build.patch