contrib: Add support for out-of-tree builds in gen-manpages.sh #12308

1. 
   laanwj commented at 10:29 AM on January 31, 2018: member

   This adds support for setting the environment variable BUILDDIR to point to executables that are outside the source directory.

   E.g. to invoke the tool when the build is in $PWD/build:

   BUILDDIR=$PWD/build contrib/devtools/gen-manpages.sh
   

   This avoids having to manually copy the generated manpages after they end up in the build instead of source path, when setting TOPDIR instead.

2. contrib: Add support for out-of-tree builds in gen-manpages.sh

   This adds support for setting the environment variable `BUILDDIR`
   to point to executables that are outside the source directory.
   
   E.g. to invoke the tool when the build is in $PWD/build:
   
   ```bash
   BUILDDIR=$PWD/build contrib/devtools/gen-manpages.sh
   ```

   526e28220a
3. laanwj added the label Scripts and tools on Jan 31, 2018
4. laanwj requested review from MarcoFalke on Feb 14, 2018
5. 
   MarcoFalke commented at 11:04 PM on February 18, 2018: member

   utACK 526e28220a351db2f439793b4a310c8863c123a9

6. MarcoFalke merged this on Feb 18, 2018
7. MarcoFalke closed this on Feb 18, 2018

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8. MarcoFalke referenced this in commit dcfe218626 on Feb 18, 2018
9. PastaPastaPasta referenced this in commit fe038439a0 on Jun 13, 2020
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11. PastaPastaPasta referenced this in commit a16d0d6094 on Jun 14, 2020
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13. PastaPastaPasta referenced this in commit 383346ab21 on Jun 17, 2020
14. PastaPastaPasta referenced this in commit d1130b8e8a on Jun 17, 2020
15. PastaPastaPasta referenced this in commit 1cf2fff1c4 on Jun 17, 2020
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Review Requested
MarcoFalke