Ran 'python3 third_party/llvm-10.0/scripts/update.py linux' to regenerate new linux configs that use options specified in the script.

* Removes targets we don't need to support, since the update.py script specifies the exact targets we want to build. When Ben first added LLVM 10 configs, he ran the default build, which built all targets.

* It also removes defines for certain options that were in update.py. Again, Ben's initial run was not done with update.py, which explains the differences.

* Finally, and as discussed in chat, there's a MIPS header in the "common" folder that shows diffs. This diff is between the version of this file generated from a Windows build vs a Linux build. This implies that perhaps this shouldn't be considered "common" afterall; however, since the original MIPS target was built from Linux, let's keep this version. I'll make sure to document this in the LLVM update doc I will write.

Bug: b/152339534
Change-Id: I2bac0f2e6d79e84332383df8c49fda92661298fb
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46248
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>