app-layer: fix -Wshorten-64-to-32 warnings v18.1

[catenacyber]

[Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/6186

Describe changes:

• fix -Wshorten-64-to-32 warnings for some files

LIBHTP_BRANCH=pr/399

OISF/libhtp#399

First commit of #9840

There must be some stuff to review more carefully

[victorjulien]

util-time, streaming buffer, common diffs don't belong in a "app-layer" commit. Please split those out

[codecov]

Codecov Report

Merging #9875 (d88e537) into master (41c0526) will decrease coverage by 0.01%.
The diff coverage is 84.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9875      +/-   ##
==========================================
- Coverage   82.45%   82.45%   -0.01%     
==========================================
  Files         973      973              
  Lines      273063   273106      +43     
==========================================
+ Hits       225155   225190      +35     
- Misses      47908    47916       +8     

Flag	Coverage Δ
fuzzcorpus	64.37% <84.48%> (+0.01%)	⬆️
suricata-verify	61.07% <81.03%> (-0.01%)	⬇️
unittests	62.91% <39.65%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[catenacyber]

util-time, streaming buffer, common diffs don't belong in a "app-layer" commit. Please split those out

But these changes are needed to get rid of the warnings for app-layer :

• suricata-common.h needed cf use of SCReturnUInt(BIT_U32(alproto)); in app-layer-detect-proto.c
• util-streaming-buffer.c: needed cf redefinition of BIT_U32 to be a u32
• util-time.h : needed cf

app-layer-htp.c:853:52: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to '__darwin_suseconds_t' (aka 'int') [-Wshorten-64-to-32]
  853 |     struct timeval tv = { SCTIME_SECS(f->startts), SCTIME_USECS(f->startts) };
      |                         ~                          ^~~~~~~~~~~~~~~~~~~~~~~~
./util-time.h:56:35: note: expanded from macro 'SCTIME_USECS'
   56 | #define SCTIME_USECS(t)          ((uint64_t)(t).usecs)

Would you like a first commit with these generic changes, and another one with only app-layer files in the same PR ?

[catenacyber]

Replaced by #9878