Update to the explanations of building raylib for different OS versions of Raspbian; including example compilation scripts. Some minor typo corrections.
#### Example compilation scripts for building a raylib application
The following are example compilation commands that can be used to build a raylib application assuming the raylib repository has been cloned to a parent directory to the application code.
```
./raylib/src
./app
```
The example assumes the application is built from `x.c` in the `app` directory. The emphasis is which libraries to utilise when building on the earlier and later versions of Raspbian OS. The examples provided are derived from code written on a Pi 0.
##### Buster
```
cc -o x x.c -I../raylib/src -I/opt/vc/include -L../raylib/src -L/opt/vc/lib -lraylib -lm -lpthread -lbrcmGLESv2 -lbrcmEGL -lvcos -lvchiq_arm -lbcm_host
```
##### Bullseye
```
cc -o x x.c -I../raylib/src -I/opt/vc/include -L../raylib/src -L/opt/vc/lib -lraylib -lm -lpthread -lGLESv2 -lEGL -lvcos -lvchiq_arm -lgbm -ldrm
```
**3. To compile on OPENBOX**
**WARNIGN:** The program compiled as `PLATFORM_DRM` under _openbox_ fails (More testing is required).
**WARNING:** The program compiled as `PLATFORM_DRM` under _openbox_ fails (More testing is required).