Point byte-compiler to functions external to dumb-jump

`declare-function` should be used to tell the byte-compiler where to look.

Makefile

@@ -8,6 +8,9 @@ test: unit
 unit:
 	${CASK} exec ert-runner
 
+compile:
+	${CASK} exec emacs -batch -L . -f batch-byte-compile dumb-jump.el
+
 install:
 	${CASK} install
 

dumb-jump.el

@@ -1961,6 +1961,8 @@ This is the persistent action (\\[helm-execute-persistent-action]) for helm."
           (plist-get result :line)
           (s-trim (plist-get result :context))))
 
+(declare-function ivy-read "ext:ivy")
+
 (defun dumb-jump-ivy-jump-to-selected (results choices _proj)
   "Offer CHOICES as candidates through `ivy-read', then execute
 `dumb-jump-result-follow' on the selected choice.  Ignore _PROJ."
@@ -1969,6 +1971,9 @@ This is the persistent action (\\[helm-execute-persistent-action]) for helm."
                       (dumb-jump-result-follow (cdr cand)))
             :caller 'dumb-jump-ivy-jump-to-selected))
 
+(declare-function helm "ext:helm")
+(declare-function helm-build-sync-source "ext:helm-source" nil t)
+
 (defun dumb-jump-prompt-user-for-choice (proj results)
   "Put a PROJ's list of RESULTS in a 'popup-menu' (or helm/ivy)
 for user to select.  Filters PROJ path from files for display."
@@ -2445,6 +2450,9 @@ PREFER-EXTERNAL will sort current file last."
           :var-to-jump var-to-jump
           :match-cur-file-front match-cur-file-front)))
 
+(declare-function tramp-dissect-file-name "tramp")
+(declare-function tramp-file-name-localname "tramp" nil t)
+
 (defun dumb-jump-read-config (root config-file)
   "Load and return options (exclusions, inclusions, etc).
 Ffrom the ROOT project CONFIG-FILE."