travis-ci: remove openssl 1.0.2 and clang compiler mode from travis to save credits.

Author: xiaocang

.travis.yml

@@ -7,7 +7,6 @@ language: c
 
 compiler:
   - gcc
-  - clang
 
 addons:
   apt:
@@ -36,8 +35,6 @@ env:
     - NGX_BUILD_JOBS=$JOBS
     - TEST_NGINX_SLEEP=0.006
   matrix:
-    - NGINX_VERSION=1.17.8 OPENSSL_VER=1.0.2u
-    - NGINX_VERSION=1.19.9 OPENSSL_VER=1.0.2u
     - NGINX_VERSION=1.19.9 OPENSSL_VER=1.1.0l
     - NGINX_VERSION=1.19.9 OPENSSL_VER=1.1.1k