minmax.h

[Jason Stover]

make on OBSD gives this error:

In file included from src/data/missing-values.h:23,
                 from src/data/variable.h:24,
                 from src/math/coefficient.h:27,
                 from src/math/ts/innovations.c:38:
src/data/value.h:24:20: minmax.h: No such file or directory
In file included from src/data/missing-values.h:23,
                 from src/data/variable.h:24,
                 from src/math/coefficient.h:27,
                 from src/math/ts/innovations.c:38:
src/data/value.h:46: error: variable-size type declared outside of any function
*** Error code 1

gnulib was supposed to include minmax.h in gl, right?

-Jason