[CMake] Enhancement of FIND_PACKAGE

[Filipe Sousa]

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Hi!

I'm thinking we could extend REQUIRED parameter from FIND_PACKAGE to be
more specific. Some packages have a lot of libraries and we may not need
all them. Something link FIND_PACKAGE(Qt4 REQUIRED GUI XML SQL) should
define Qt4_FIND_REQUIRED-GUI, Qt4_FIND_REQUIRED-XML and
Qt4_FIND_REQUIRED-SQL.

What do you think?

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Filipe Sousa
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