bug: the test command under Linux is incorrect with perl 5.26

[spacewander]

Type make test under Linux got Can't locate t/APISIX.pm in @INC.

The code in Makefile:

test:
ifeq ($(UNAME),Darwin)
	prove -I../test-nginx/lib -I./ -r -s t/
else
	prove -I../test-nginx/lib -r -s t/
endif

It seems that the difference the behavior is caused by the version of perl instead of the platform. The perl I used is v5.26.1.

Maybe we can always add -I. in the command regardless of the platform or the version of perl? Adding extra path isn't harmful.

[membphis]

welcome PR ^_^