user/spack: revert temporary PATH change. fixes #1292.

user/spack/APKBUILD

@@ -39,12 +39,6 @@ prepare()
 }
 
 check() {
-	##
-	# This is to prevent warnings about "Multiple definitions of compiler"
-	# in the event that 'ccache' is present and symlinked at /usr/local.
-	#
-	export PATH=/usr/sbin:/usr/bin:/sbin:/bin;
-
 	##
 	# On first run, Spack >=0.17.0 will bootstrap "clingo",
 	# Spack's new "concretizer". The output from this process