Merge with stable

tests: introduce c-style conditional sections in .t tests This makes it possible to have conditional sections like: #if windows $ echo foo foo #else $ echo bar bar #endif The directives and skipped sections are treated like comments, so don't interleave them with commands and their output. The parameters to #if are evaluated while preparing the test by passing them over to hghave. Requirements can thus be negated with 'no-' prefix, and multiple requirements must all be true to return true. [ original upstream message ]

run-tests: don't add python lines to expected dict For test input lines of *.t files starting with ' >>> ', the code block for ' >>> ' 609: if l.startswith(' >>> '): # python inlines 610: after.setdefault(pos, []).append(l) was (unsurprisingly) executed, but because there was an "if" instead of an "elif" on the condition "l.startswith(' ... ')", program execution proceeded to line 636 635: elif l.startswith(' '): # results 636: # queue up a list of expected results 637: expected.setdefault(pos, []).append(l[2:]) due to the fact that if l starts with ' >>> ' it also starts with ' '. The net effect was that python command lines in *.t files were (surprisingly) also added to the "expected" dict. This caused no externally observable bad behavior, as the "expected" dict was not consulted for these lines. [ original upstream message ]

run-test: replace backslashes in TESTDIR This may cause troubles in MSYS on Windows. [ original upstream message ]