lib: make printfrr int64_t usable

[eqvinox]

also moves from -Os to -O2 & adds a vim snippet

with this, %Lu should actually be usable.

[NetDEF-CI]

Continuous Integration Result: SUCCESSFUL

Congratulations, this patch passed basic tests

Tested-by: NetDEF / OpenSourceRouting.org CI System

CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-8032/

This is a comment from an automated CI system.
For questions and feedback in regards to this CI system, please feel free to email
Martin Winter - mwinter (at) opensourcerouting.org.

Warnings Generated during build:

Checkout code: Successful with additional warnings

Report for compiler.h | 4 issues
===============================================
< WARNING: do not add new typedefs
< #261: FILE: /tmp/f1-13487/compiler.h:261:
< WARNING: do not add new typedefs
< #263: FILE: /tmp/f1-13487/compiler.h:263:
Report for isis_misc.c | 5 issues
===============================================
< WARNING: strncat() is error-prone; please use strlcat() if possible#486: FILE: /tmp/f1-13487/isis_misc.c:486:
---
> WARNING: strncat() is error-prone; please use strlcat() if possible#485: FILE: /tmp/f2-13487/isis_misc.c:485:
24c24
< #513: FILE: /tmp/f1-13487/isis_misc.c:513:

---

CLANG Static Analyzer Summary

• Github Pull Request 4509, comparing to Git base SHA 8fd142d

No Changes in Static Analysis warnings compared to base

4 Static Analyzer issues remaining.

See details at
https://ci1.netdef.org/browse/FRR-FRRPULLREQ-8032/artifact/shared/static_analysis/index.html

[LabN-CI]

💚 Basic BGPD CI results: SUCCESS, 0 tests failed

Results table

_	_
Result	SUCCESS git merge/4509 39c94f8
Date	06/12/2019
Start	15:36:29
Finish	15:59:06
Run-Time	22:37
Total	1813
Pass	1813
Fail	0
Valgrind-Errors	0
Valgrind-Loss	0
Details	vncregress-2019-06-12-15:36:29.txt
Log	autoscript-2019-06-12-15:37:34.log.bz2
Memory	436 413 360

For details, please contact louberger