FFmpeg iOS build script

This is a shell script to build FFmpeg libraries for iOS apps.

Tested with:

Usage

To build everything:
```
  ./build-ffmpeg.sh
```
To build arm64 libraries:
```
  ./build-ffmpeg.sh arm64
```
To build fat libraries for armv7 and x86_64 (64-bit simulator):
```
  ./build-ffmpeg.sh armv7 x86_64
```
To build fat libraries from separately built thin libraries:
```
  ./build-ffmpeg.sh lipo
```

Name		Name	Last commit message	Last commit date
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README.md		README.md
build-ffmpeg.sh		build-ffmpeg.sh