handy.h: Remove extraneous parens
makedepend.SH: Retain '/**/' comments

These comments may actually be necessary.
makedepend.SH: Remove some unnecessary white space

Multi-line preprocessor directives are now joined into single lines.
This can create lines too long for the preprocessor to handle.  This
commit removes blanks adjoining comments that get deleted.  This makes
things somewhat less likely to exceed the limit.

This commit also fixes several [] which were meant to each match a tab
or a blank, but editors converted the tabs to blanks
makedepend.SH: White-space only

Align continuation backslashes
makedepend.SH: Properly join continuation lines

I had thought that a continuation introduced a space.  But no,
a continuation can happen in the middle of a token.
makedepend.SH: Split very long preprocessor lines

This avoids preprocessor limitations