patch packpack to support custom environment vars

utils/packpack/environment

@@ -0,0 +1,3 @@
+DEB_BUILD_OPTIONS="parallel=4"
+DEBUILD_LINTIAN="no"
+

utils/packpack/envvars.patch

@@ -0,0 +1,25 @@
+From 871835ecc4ee380fe42d1ef2a58dca9dc4e9af5f Mon Sep 17 00:00:00 2001
+From: Andrew Bauer <zonexpertconsulting@outlook.com>
+Date: Wed, 21 Feb 2018 12:07:12 -0600
+Subject: [PATCH] allow one to load custom environment variables
+
+---
+ packpack | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/packpack b/packpack
+index 6f4c80f..abab604 100755
+--- a/packpack
++++ b/packpack
+@@ -128,6 +128,11 @@ chmod a+x ${BUILDDIR}/userwrapper.sh
+ env | grep -E "^PRODUCT=|^VERSION=|^RELEASE=|^ABBREV=|^TARBALL_|^CHANGELOG_|^CCACHE_|^PACKAGECLOUD_|^SMPFLAGS=|^OS=|^DIST=" \
+     > ${BUILDDIR}/env
+ 
++# Load user environment variables
++if [ -f "${USER_ENV_FILE}" ]; then
++    cat ${USER_ENV_FILE} >> ${BUILDDIR}/env
++fi
++
+ #
+ # Setup cache directory
+ #

utils/packpack/startpackpack.sh

@@ -108,6 +108,12 @@ commonprep () {
         patch -p1 < utils/packpack/packpack-rpm.patch
     fi
 
+    # Patch packpack
+    patch --dry-run --silent -f -p1 < utils/packpack/envvars.patch
+    if [ $? -eq 0 ]; then
+        patch -p1 < utils/packpack/envvars.patch
+    fi
+
     # The rpm specfile requires we download the tarball and manually move it into place
     # Might as well do this for Debian as well, rather than git submodule init
     CRUDVER="3.0.10"
@@ -231,7 +237,8 @@ execpackpack () {
         parms="-f utils/packpack/redhat_package.mk redhat_package"
     else
         parms=""
-        export SMPFLAGS="-j4 --lintian-opts --no-lintian"
+        export SMPFLAGS="-j4"
+        export USER_ENV_FILE="utils/packpack/environment"
     fi
 
     if [ "${TRAVIS}" == "true"  ]; then