Set WITH_G4 to FALSE when undefined

[eflumerf]

No description provided.

[FNALbuild]

Hi @eflumerf,
You have proposed changes to files in these packages:

• /

which require these tests: build.

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⌛ The following tests have been triggered for dd6f51f: build (Build queue - API unavailable)

About FNALbuild. Code review on Mu2e/Offline.

[FNALbuild]

☀️ The build tests passed at dd6f51f.

Test	Result	Details
test with	✅	Command did not list any other PRs to include
merge	✅	Merged dd6f51f at a04e36a
build (prof)	✅	Log file. Build time: 04 min 33 sec
ceSimReco	✅	Log file.
g4test_03MT	✅	Log file.
transportOnly	✅	Log file.
POT	✅	Log file.
g4study	✅	Log file.
cosmicSimReco	✅	Log file.
cosmicOffSpill	✅	Log file.
ceSteps	✅	Log file.
ceDigi	✅	Log file.
muDauSteps	✅	Log file.
ceMix	✅	Log file.
rootOverlaps	✅	Log file.
g4surfaceCheck	✅	Log file.
trigger	✅	Log file.
check_cmake	❌	Log file. Return Code 1.
FIXME, TODO	✅	TODO (0) FIXME (0) in 0 files
clang-tidy	✅	0 errors 0 warnings
whitespace check	✅	no whitespace errors found

N.B. These results were obtained from a build of this Pull Request at dd6f51f after being merged into the base branch at a04e36a.

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