gcc10-bootstrap: random failure

[catap (Kirill A. Korinsky)]

Build bot is failed on Yosemite as:

Comparing stages 2 and 3
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
Bootstrap comparison failure!

which can't be explained as environment, probably as a sort of random failure which may depends on number of CPU which is available for building gcc.

[catap (Kirill A. Korinsky)]

Build bot logs: ​https://build.macports.org/builders/ports-10.10_x86_64-builder/builds/180787

Link to GCC's issue: ​https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100340

[kencu (Ken)]

Krill, there are a hundred different reasons for bootstrap comparison failures.

The one in that gcc ticket is specific to that Xcode 12 problem, and has nothing to do with this one, on 10.10.

These can be hard to sort out properly, or easy to work around by just disabling the check :)

[catap (Kirill A. Korinsky)]

In 8ec8efb9c864fcacb7cffcad324bdec24c966991/macports-ports (master):

gcc10-bootstrap: skip bootstrap comparison

Closes: #65033