[Rpm-maint] [rpm-software-management/rpm] Regression: --define '_target_os linux' does not work since version 4.20.0 (Issue #3866)

[Aditya Garg]

AdityaGarg8 created an issue (rpm-software-management/rpm#3866)

**Describe the bug**
In case I build rpm packages on macOS, I can not longer set the target os to linux since version 4.20.0

**To Reproduce**
Steps to reproduce the behavior:
1. Create a sample spec file in macOS
2. Run `rpmbuild -bb --define '_target_os linux' "/path/to/specfile.spec"`

Please link or attach the packages or spec files involved.

```spec
		Name:       apple-firmware
		Version:    ${ver}
		Release:    1
		Summary:    Wi-Fi and Bluetooth firmware for T2 Macs
		License:    Proprietary
		BuildArch:  noarch

		Source1: firmware.tar

		%description
		Wi-Fi and Bluetooth firmware for T2 Macs

		%prep
		tar -xf %{SOURCE1}

		%build

		%install
		mkdir -p %{buildroot}/usr/lib/firmware/brcm
		install -m 644 brcm* %{buildroot}/usr/lib/firmware/brcm/

		%posttrans
		modprobe -r brcmfmac_wcc || true
		modprobe -r brcmfmac || true
		modprobe brcmfmac || true
		modprobe -r hci_bcm4377 || true
		modprobe hci_bcm4377 || true

		%files
		/usr/lib/firmware/brcm/*
```

**Expected behavior**
`rpm -qp /path/to/file.rpm --qf '%{OS}\n'` should show linux

**Output**
`rpm -qp /path/to/file.rpm --qf '%{OS}\n'` is showing darwin on macOS

**Environment**
 - OS / Distribution: macOS Sequoia
 - Version: rpm-4.20.1

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