Small mistake in the flavors section of the porters handbook

[Craig Leres]

Example 7.2 on this page has a mistake:

 
https://www.freebsd.org/doc/en/books/porters-handbook/flavors-using.html

The conditional needs to use == instead of = or else you get:

     make: "/usr/ports/devel/subversion/Makefile" line 53: warning: 
String comparison operator should be either == or !=

		Craig
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