ci: update centos builds

Author: ethomson

.github/workflows/nightly.yml

@@ -112,13 +112,15 @@ jobs:
             name: centos7
           env:
             CMAKE_OPTIONS: -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
+            SKIP_NEGOTIATE_TESTS: true
             BUILD_PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
           os: ubuntu-latest
         - # CentOS 8
           container:
             name: centos8
           env:
             CMAKE_OPTIONS: -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
+            SKIP_NEGOTIATE_TESTS: true
           os: ubuntu-latest
         - # macOS
           os: macos-10.15

ci/docker/centos7

@@ -4,7 +4,6 @@ RUN yum install -y \
 	which \
 	git \
 	libarchive \
-	cmake \
 	gcc \
 	gcc-c++ \
 	make \