travis: install libnss3-dev only for --with-nss build

Reduces the time needed for the other jobs a little.

Closes https://github.com/curl/curl/pull/3721

diff --git a/.travis.yml b/.travis.yml
index 124bac29adc585fde54a5e0105d977c877f8ec89..4deceee6680f5d5bde8f5180ca9dc9c1acf81d22 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,7 +31,6 @@ addons:
             - libidn2-0-dev
             - autopoint  # for libpsl that needs autoreconf that uses gettext that needs it
             - libunistring-dev # for libidn2 needed by libpsl
-            - libnss3-dev
             - gnutls-bin
             - libgnutls28-dev
 
@@ -190,6 +189,7 @@ matrix:
                   packages:
                       - *common_packages
                       - clang-7
+                      - libnss3-dev
         - os: linux
           compiler: gcc
           dist: trusty