Add buildKitName buildKitHostOs buildKitTargetOs buildKitTargetArch buildKitVersionMajor buildKitVersionMinor attributes for kit.
The KitDetect result that can be configured by the user directly.
Detecting gcc triple and clang triple properly
Now detecting gcc triple and clang triple from Target: attribute.
Or from line starts with `Reading specs from` for very old compilers such as:
```
Reading specs from C:\\WindRiver-VxWorks653-2.2.0.0\\gnu\\3.3.2-vxworks653\\x86-win32\\bin\..\\lib\\gcc-lib\\powerpc-wrs-vxworksae\\3.3.2\\specs
Reading specs from ../lib/gcc-lib/powerpc-wrs-vxworks/gcc-2.96/specs
```
Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Co-authored-by: Andreea Isac <48239328+andreeis@users.noreply.github.com>