Add some env vars to DOTepics necessary for comilation of EPICS

roles/epics/templates/DOTepics

@@ -3,3 +3,5 @@ export LD_LIBRARY_PATH=/usr/local/share/base-{{epics_version}}/lib/linux-x86_64:
 export EPICS_CA_ADDR_LIST=$(dig +short ankasr-appcache.anka.kit.edu)
 export PATH=/usr/local/share/base-{{epics_version}}/bin/linux-x86_64:$PATH
 export EPICS_BASE=/usr/local/share/base-{{epics_version}}
+export EPICS_HOST_ARCH=linux-x86_64
+export HOST_ARCH=linux-x86_64