tests: don't override PATH variable when running tests

I have a test system that requires a PATH different than what is
embedded into the test suite's Makefile.  While there is perhaps some
risk in using the caller's PATH in the test suite, given that this is
a test suite I expect that the caller would be aware of such risks.

Signed-off-by: Paul Moore <[email protected]>
[OM: tweaked the subject line]
Signed-off-by: Ondrej Mosnacek <[email protected]>

Author: pcmoore

tests/Makefile

@@ -184,7 +184,7 @@ all:
 
 test: all
 	chcon -R -t test_file_t .
-	@SUBDIRS="$(SUBDIRS)" PATH=/usr/bin:/bin:/usr/sbin:/sbin ./runtests.pl
+	@SUBDIRS="$(SUBDIRS)" ./runtests.pl
 
 clean:
 	@for subdir in $(SUBDIRS); do \