[WIP] Fix Xcode 12 SPM Error

[yhkaplan]

Addresses the error below. It appears in Xcode 12 because 12 drops support for iOS 8.0. Going this far to update Package.swift, I might as well drop support in Cocoapods + Carthage for iOS 8.0....

The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.0.99.

libwebp-Xcode - Package.swift doesn't happen an explicit minimum deployment target, therefore it is set to iOS 9.0 in Xcode 12, causing the error above.

Possible Solutions

1. Drop support for iOS 8 and make minimum deployment target iOS 9
2. Explicitly make libwebp-Xcode - Package.swift supply iOS 8 as minimum deployment target

iOS 8 came out in 2014 and likely many app don't even support it anymore, so I think 1. makes more sense, but it should be a decision made project wide for each library under the SDWebImage instead of making changes in piecemeal, which would be more confusing.

[codecov]

Codecov Report

Merging #45 into master will increase coverage by 1.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   81.07%   82.26%   +1.18%     
==========================================
  Files           2        2              
  Lines         761      761              
==========================================
+ Hits          617      626       +9     
+ Misses        144      135       -9     

Flag	Coverage Δ
#ios	82.26% <ø> (+1.18%)	⬆️

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

Impacted Files	Coverage Δ
SDWebImageWebPCoder/Classes/SDImageWebPCoder.m	82.16% <0.00%> (+1.18%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 84c97db...40c3490. Read the comment docs.

[dreampiggy]

Actually, another solution:

change libwebp's min deployment target version: SDWebImage/libwebp-Xcode#5

[dreampiggy]

But libwebp need Google team to release another version. I can not Release a libwebp version where Google official source repo does not contains.

So things suck.

See more: https://groups.google.com/a/webmproject.org/g/webp-discuss/c/bAxEA6MW8ug

---

Seems libwebp decide to release 1.2.0 in Q4. Should we wait for that ? Or I release a libwebp 1.1.1 patch version (where Google don't have one) ?

[dreampiggy]

This been soved by #48