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Changes 3.5.0:
* added Symmetric/Hermitian LDLT factorization routines with rook pivoting algorithm
* 2-by-1 CSD to be used for tall and skinny matrix with orthonormal columns (in \ 
LAPCK 3.4.0, we already integrated CSD of a full square orthogonal matrix)
* New stopping criteria for balancing.

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This packages needs a Fortran 95 compiler to build, Fortran 77 is not
good enough.

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"user-destdir" is default these days

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"fortran" -> "fortran77" except where it is clear that it \ 
isn't F77.
"fortran" is alias of "fortran77" for now, but it will \ 
change later.

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Follow f2c/libf2c split: bump revision of all packages
that list Fortran in used languages.

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Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

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Use MASTER_SITE_NETLIB for Netlib and its mirrors.
Discussed with Tobias Nygren.

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fix typo.

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Tell libtool that its linking fortran so the correct libraries get
linked in.

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Note that math/blas is the reference implementation of BLAS.