MFH: r457958
science/InsightToolkit: Modify patch to use ${CMAKE_DL_LIBS}
${CMAKE_DL_LIBS} expands to "" on FreeBSD where the dl functions are
included in the Standard C library (libc), but to "dl" on operating
systems where the dl functions are part of libdl.
This change to the patch does not result in a change in contents of the
resulting package.
Reported by: jbeich
Approved by: ports-secteam (blanket)