Set FOP_OPTS, the variable passed by the fop shell script to the Java
interpreter, to use the same minimum values for stack and heap space on
all architectures. The built-in i386 defaults are smaller than those on
amd64, so i386 fop PDF builds ran out of space and failed. Working
values were copied from the amd64 defaults.

Reviewed by: gabor, blackend, hrs
Approved by: hrs