ettercap: add missing geoip dependency
ettercap: add missing geoip dependency

On Mojave 10.14.3, `brew install --HEAD ettercap` is unable to complete configuration at:

==> cmake .. -DCMAKE_C_FLAGS_RELEASE=-DNDEBUG -DCMAKE_CXX_FLAGS_RELEASE=-DNDEBUG -DCMAKE_INSTALL_PREFIX=/usr/local/Cellar/ettercap/HEAD-5fb6048_1 -DCMAKE_BUILD_TY

Last 15 lines from ~/Library/Logs/Homebrew/ettercap/01.cmake:
-- Looking for strndup
-- Looking for strndup - found
-- GeoIP support requested. Will look for the legacy GeoIP C library
-- Found PkgConfig: /usr/local/bin/pkg-config (found version "0.29.2")
-- Checking for one of the modules 'geoip'
-- Could NOT find GEOIP (missing: GEOIP_LIBRARY GEOIP_INCLUDE_DIR)
CMake Error at cmake/Modules/EttercapLibCheck.cmake:211 (message):
  GeoIP not found!
Call Stack (most recent call first):
  CMakeLists.txt:106 (include)
-- Configuring incomplete, errors occurred!

Proposed fix:
Add dependency for:

```
✘ brew info geoip
geoip: stable 1.6.12 (bottled), HEAD
This library is for the GeoIP Legacy format (dat)
```
https://github.com/maxmind/geoip-api-c

- [x ] Have you followed the [guidelines for contributing](https://github.com/Homebrew/homebrew-core/blob/master/CONTRIBUTING.md)?
- [x ] Have you checked that there aren't other open [pull requests](https://github.com/Homebrew/homebrew-core/pulls) for the same formula update/change?
- [x ] Have you built your formula locally with `brew install --build-from-source <formula>`, where `<formula>` is the name of the formula you're submitting?
- [x ] Is your test running fine `brew test <formula>`, where `<formula>` is the name of the formula you're submitting?
- [ x] Does your build pass `brew audit --strict <formula>` (after doing `brew install <formula>`)?

-----

Closes #39522.

Signed-off-by: Chongyu Zhu <042dc4512fa3d391c5170cf3aa61e6a638f84342@lembacon.com>

filcab/homebrew-core,mbcoguno/homebrew-core,edporras/homebrew-core,nbari/homebrew-core,lembacon/homebrew-core,sjackman/homebrew-core,zyedidia/homebrew-core,dsXLII/homebrew-core,mahori/homebrew-core,filcab/homebrew-core,mbcoguno/homebrew-core,Moisan/homebrew-core,mfikes/homebrew-core,Homebrew/homebrew-core,stgraber/homebrew-core,cblecker/homebrew-core,JCount/homebrew-core,maxim-belkin/homebrew-core,jvillard/homebrew-core,chrisfinazzo/homebrew-core,LinuxbrewTestBot/homebrew-core,aabdnn/homebrew-core,jvillard/homebrew-core,lemzwerg/homebrew-core,aabdnn/homebrew-core,jvillard/homebrew-core,JCount/homebrew-core,mvitz/homebrew-core,zmwangx/homebrew-core,wolffaxn/homebrew-core,Homebrew/homebrew-core,mbcoguno/homebrew-core,chrisfinazzo/homebrew-core,uyjulian/homebrew-core,makigumo/homebrew-core,rwhogg/homebrew-core,spaam/homebrew-core,mfikes/homebrew-core,nandub/homebrew-core,Linuxbrew/homebrew-core,Moisan/homebrew-core,wolffaxn/homebrew-core,adam-moss/homebrew-core,dsXLII/homebrew-core,jabenninghoff/homebrew-core,rwhogg/homebrew-core,mvitz/homebrew-core,jabenninghoff/homebrew-core,lembacon/homebrew-core,cblecker/homebrew-core,adam-moss/homebrew-core,zmwangx/homebrew-core,edporras/homebrew-core,nbari/homebrew-core,stgraber/homebrew-core,maxim-belkin/homebrew-core,lembacon/homebrew-core,BrewTestBot/homebrew-core,spaam/homebrew-core,zyedidia/homebrew-core,mahori/homebrew-core,LinuxbrewTestBot/homebrew-core,makigumo/homebrew-core,mvitz/homebrew-core,Linuxbrew/homebrew-core,nandub/homebrew-core,lemzwerg/homebrew-core,BrewTestBot/homebrew-core,wolffaxn/homebrew-core,uyjulian/homebrew-core,sjackman/homebrew-core