run tests without activated host compiler

- fixes issues where the activated release dmd overrides and hijacks the link
  paths of the generated dmd (by it's set LIBRARY_PATH/LD_LIBRARY_PATH)
- build and test commands already activate and deactivate host compiler where necessary

ci.sh

@@ -156,7 +156,7 @@ download_install_sh() {
   done
 }
 
-activate_d() {
+install_d() {
   local install_sh="install.sh"
   download_install_sh "$install_sh"
   # DUB isn't needed for gdc
@@ -166,5 +166,5 @@ activate_d() {
       # shellcheck disable=2016
       sed 's/dub="dub-$(fetch $url)"/dub=dub/' -i "$install_sh"
   fi
-  CURL_USER_AGENT="$CURL_USER_AGENT" bash "$install_sh" "$1" --activate
+  CURL_USER_AGENT="$CURL_USER_AGENT" bash "$install_sh" "$1"
 }

semaphoreci.sh

@@ -25,7 +25,7 @@ source ci.sh
 # Always source a DMD instance
 ################################################################################
 
-source "$(activate_d "$DMD")"
+install_d "$DMD"
 
 ################################################################################
 # Define commands