patch 8.2.4046: some error messages not in the right place

Problem:    Some error messages not in the right place.
Solution:   Adjust the errors file.  Fix typo.

patch 8.2.4045: some global functions are only used in one file

Problem:    Some global functions are only used in one file.
Solution:   Make the functions static. (Yegappan Lakshmanan, closes vim#9492)

patch 8.2.4044: Vim9: no error when importing the same script twice

Problem:    Vim9: no error when importing the same script twice.
Solution:   Give an error, unless it is a reload.

patch 8.2.4043: using int for second argument of ga_init2()

Problem:    Using int for second argument of ga_init2().
Solution:   Remove unnessary type cast (int) when using sizeof().

patch 8.2.4042: Vim9: build error

Problem:    Vim9: build error.
Solution:   Use grow array instead of character pointer.

patch 8.2.4041: using unitialized pointer

Problem:    Using unitialized pointer.
Solution:   Store "ht" when variable is in another script.

patch 8.2.4040: keeping track of allocated lines is too complicated

Problem:    Keeping track of allocated lines in user functions is too
            complicated.
Solution:   Instead of freeing individual lines keep them all until the end.

patch 8.2.4039: the xdiff library is linked in even when not used

Problem:    The xdiff library is linked in even when not used.
Solution:   Use configure to decide whether xdiff object files are included.

patch 8.2.4038: various code not used when features are disabled

Problem:    Various code not used when features are disabled.
Solution:   Add #ifdefs. (Dominique Pellé, closes vim#9491)

patch 8.2.4037: Insert mode completion is insufficiently tested

Problem:    Insert mode completion is insufficiently tested.
Solution:   Add more tests.  Fix uncovered memory leak. (Yegappan Lakshmanan,
            closes vim#9489)