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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

Give the highest priority to libraries specified via --libraries flag, if more than one library matches includes during compilation.

What is the current behavior?

$ cat Blink.ino 
#include <Library.h>
void setup() { }
void loop() { }
$ arduino-cli compile -b arduino:avr:uno --format json | jq .builder_result.used_libraries[].name
"Library"
$ arduino-cli compile -b arduino:avr:uno --format json --library ../AnotherLibrary | jq .builder_result.used_libraries[].name
"Library"

What is the new behavior?

$ arduino-cli compile -b arduino:avr:uno --format json | jq .builder_result.used_libraries[].name
"Library"
$ arduino-cli compile -b arduino:avr:uno --format json --library ../AnotherLibrary | jq .builder_result.used_libraries[].name
"AnotherLibrary"

Does this PR introduce a breaking change, and is titled accordingly?

Other information

Fix #2106