QBDD deadlock fix (and style)

A potential deadlock in QBDD Kronecker products has been fixed. Beyond that, several (non-breaking) function prototype changes have been made in accordance with standards for style.

Full Changelog: vm6502q.v9.9.37...vm6502q.v9.9.42

sha1sum results:
fe5530fe1581d0d8635a114aeee95215ec071a15 libqrack-macosx_14_0_arm64.zip
1ca012b7f93d388b410df9236591980e0d6047cc libqrack-manylinux2014_x86_64.zip
33a39357b7178d5c1ac76600c773ca7f7cb94182 libqrack-manylinux_2_35_x86_64.zip
c83058b526072ef5f7bf3f343bfb5031c4034118 libqrack-manylinux_2_39_x86_64.zip
ad64a4fa2565fbbe9e4ff3fd82dc9eb31b5f30ce libqrack-win-amd64.zip