configure: enable the gallium loader only when needed

With the gallium megadrivers we've converted most ST to optionally
use either statically linked in or shared pipe-drivers.

The hardcoded switch forgot to conditionally enable the build of the
shared pipe-drivers which resulted in them being constantly build.

Cc: "10.3" <[email protected]>
Cc: James Ausmus <[email protected]>
Reported-by: James Ausmus <[email protected]>
Tested-by: James Ausmus <[email protected]>
Bugzilla: https://code.google.com/p/chromium/issues/detail?id=412089
Signed-off-by: Emil Velikov <[email protected]>

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