[O] Regression: commit 38de20287fbf26d0a84d6264c030fd8fddadfdc6 prevents successful build of org-timer.el

[Humberto Nanni]

After the mentioned commit, the build of org-timer.el fails:

[...]
-:8737: warning: @table has text but no @item
-:9518: warning: @table has text but no @item
-:9588: warning: @table has text but no @item
...skipping...

In end of data:
org-plot.el:354:1:Warning: the following functions are not known to be
    defined: first, second
Wrote /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-plot.elc
Compiling 
/home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-protocol.el...
Wrote /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-protocol.elc
Compiling /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-rmail.el...
Wrote /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-rmail.elc
Compiling /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-src.el...
Wrote /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-src.elc
Compiling /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-table.el...
Wrote /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-table.elc
Compiling /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-timer.el...

In toplevel form:
org-timer.el:38:1:Error: Symbol's function definition is void: incf
Compiling 
/home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-version.el...
Compiling /home/robaccia/roba/vicenda/sources/org/org-mode/lisp/org-w3m.el..