centos7 needs bzip2 not always default

scripts/eosio_build_centos.sh

@@ -125,7 +125,7 @@
 
 	printf "\\n\\tYUM repository successfully updated.\\n\\n"
 
-	DEP_ARRAY=( git autoconf automake libtool ocaml.x86_64 doxygen graphviz-devel.x86_64 libicu-devel.x86_64 \
+	DEP_ARRAY=( git autoconf automake bzip2 libtool ocaml.x86_64 doxygen graphviz-devel.x86_64 libicu-devel.x86_64 \
 	bzip2-devel.x86_64 openssl-devel.x86_64 gmp-devel.x86_64 python-devel.x86_64 gettext-devel.x86_64)
 	COUNT=1
 	DISPLAY=""
@@ -708,4 +708,4 @@ mongodconf
 		printf '\texport PATH=${HOME}/opt/mongodb/bin:$PATH\n'
 		printf "\\tcd %s; make test\\n\\n" "${BUILD_DIR}"
 	return 0
-	}
\ No newline at end of file
+	}