compilation of pixman breaks with "noinst_LTLIBRARIES must be set with `=' before using `+="

[Jens Stroebel]

			Hello all.

As the subject states, compilation of current pixman git here breaks
with said error. This is caused by

commit 5fc4d5ab1fae8677f5a95f5eb0e4fad3a9e0bf82

as far as I can tell, as it removed a previous declaration using "=" and
left the following declaration using "+=" unchanged.

		greets,
		  Jens
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