[lldb] don't run TestUnwindFramelessFaulted.py on Linux

I thought I could call $(CPP) to preprocess the assembly
file, but the aarch64-ubuntu bot runs this as clang -E and
it issues a warning and no output file, apparently,

build/bin/clang -E -o interrupt-and-trap-funcs.s /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/unwind/frameless-faulted/interrupt-and-trap-funcs.s
clang: warning: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/unwind/frameless-faulted/interrupt-and-trap-funcs.s: 'assembler' input unused [-Wunused-command-line-argument]

/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang -g -O0     -c -o interrupt-and-trap-funcs.o interrupt-and-trap-funcs.s
clang: error: no such file or directory: 'interrupt-and-trap-funcs.s'
clang: error: no input files

Author: jasonmolenda

lldb/test/API/functionalities/unwind/frameless-faulted/TestUnwindFramelessFaulted.py

@@ -10,7 +10,7 @@
 class TestUnwindFramelessFaulted(TestBase):
     NO_DEBUG_INFO_TESTCASE = True
 
-    @skipIf(oslist=no_match([lldbplatformutil.getDarwinOSTriples(), "linux"]))
+    @skipIf(oslist=no_match([lldbplatformutil.getDarwinOSTriples()]))
     @skipIf(archs=no_match(["aarch64", "arm64", "arm64e"]))
 
     # The static linker in Xcode 15.0-15.2 on macOS 14 will mislink