Fix test to succeed for big endian mips
Summary
test/tcustomvar1.pp test currently fails for mips-linux target, and also big endian powerpc and powerpc64 linux, and more:
https://www.freepascal.org/testsuite/cgi-bin/new-testsuite2.cgi?action=4&testfilename=test%2Ftcustomvar1.pp&os=15&cpu=8&version=0&date=&submitter=&machine=&comment=&limit=500&cond=&Category=3&failedonly=1
System
- **Operating system: big endian linux, aix or solaris
- **Processor architecture: big endian targets: mips, powerpc and powerpc64 tested
- Device:
What is the current bug behavior?
Currently fails on those targets:
https://www.freepascal.org/testsuite/cgi-bin/new-testsuite2.cgi?action=4&testfilename=test%2Ftcustomvar1.pp&os=15&cpu=8&version=0&date=&submitter=&machine=&comment=&limit=500&cond=&Category=3&failedonly=1
What is the behavior after applying this patch?
Should complete successfully with that change, but I am not expert enough to tell if the behavior is correct or not with that change, or it is the code generator that should be modified.