util: set correct stack level on deprecation warnings
Without this patch, you'll get something like this:
<path>/mercurial/util.py:3784: DeprecationWarning: 'util.hgexecutable'
is deprecated, use 'utils.procutil.hgexecutable'
(but on one line)
Differential Revision: https://phab.mercurial-scm.org/D3331
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2