patch 7.4.2143

Problem:    A funccal is garbage collected while it can still be used.
Solution:   Set copyID in all referenced functions.  Do not list lambda
            functions with ":function".

patch 7.4.2142

Problem:    Leaking memory when redefining a function.
Solution:   Don't increment the function reference count when it's found by
            name. Don't remove the wrong function from the hashtab.  More
            reference counting fixes.

patch 7.4.2141

Problem:    Coverity reports bogus NULL check.
Solution:   When checking for a variable in the funccal scope don't pass the
            varname.

patch 7.4.2140

Problem:    Tiny build fails.
Solution:   Add dummy typedefs.

patch 7.4.2139

Problem:    :delfunction causes illegal memory access.
Solution:   Correct logic when deciding to free a function.

patch 7.4.2138

Problem:    Test 86 and 87 fail.
Solution:   Call func_ref() also for regular functions.

patch 7.4.2137

Problem:    Using function() with a name will find another function when it is
            redefined.
Solution:   Add funcref().  Refer to lambda using a partial.  Fix several
            reference counting issues.

patch 7.4.2136

Problem:    Closure function fails.
Solution:   Don't reset uf_scoped when it points to another funccal.

patch 7.4.2135

Problem:    Various tiny issues.
Solution:   Update comments, white space, etc.

patch 7.4.2134

Problem:    No error for using function() badly.
Solution:   Check for passing wrong function name. (Ken Takata)