- restore texinfo macros for SLE15

- export CONFIG_SHELL=/bin/sh before running configure: results in
  the shell script (egrep/fgrep) to receive a /bin/sh shebang
  instead of requiring bash (the local shell used to build).

- update to 3.11:
  * With -P, patterns like [\d] now work again. Fixing this
    has caused grep to revert to the behavior of grep 3.8, in that
    patterns like \w and ^H go back to using ASCII rather
    than Unicode interpretations.
    However, future versions of GNU grep and/or PCRE2 are
    likely to fix this and change the behavior of \w and ^H
    back to Unicode again, without breaking [\d] as 3.10 did.
- removes testsuite.patch in older distributions

- update to 3.10:
  * With -P, \d now matches only ASCII digits, regardless of
    PCRE options/modes. The changes in grep-3.9 to make ^H and \w
    work properly had the undesirable side effect of making \d
    also match e.g., the Arabic digits: ٠١٢٣٤٥٦٧٨٩.
    With grep-3.9, -P '\d+' would match that ten-digit (20-byte)
    string. Now, to match such a digit, you would use \p{Nd}.
    Similarly, \D is now mapped to [^0-9].

- Update to grep 3.9
  * With -P, some non-ASCII UTF8 characters were not recognized as
    word-constituent due to our omission of the PCRE2_UCP flag.
  * When given multiple patterns the last of which has a back-reference,
    grep no longer sometimes mistakenly matches lines in some cases

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