[OpenMP] Remove %preload-tool definition from archer tests (llvm#150779)

This was added in 2b8115b and it looks
like this wass essentially a copy paste from one of the other lit config
files. This substitution is unused within the tests however and contains
a deprecated %T directive, so remove it.

Author: boomanaiden154

openmp/tools/archer/tests/lit.cfg

@@ -130,10 +130,3 @@ config.substitutions.append(("%deflake", os.path.join(os.path.dirname(__file__),
 config.substitutions.append(("FileCheck", config.test_filecheck))
 config.substitutions.append(("%not", config.test_not))
 config.substitutions.append(("%sort-threads", "sort --numeric-sort --stable"))
-if config.operating_system == 'Windows':
-    # No such environment variable on Windows.
-    config.substitutions.append(("%preload-tool", "true ||"))
-elif config.operating_system == 'Darwin':
-    config.substitutions.append(("%preload-tool", "env DYLD_INSERT_LIBRARIES=%T/tool.so"))
-else:
-    config.substitutions.append(("%preload-tool", "env LD_PRELOAD=%T/tool.so"))