testsuite: Don't rely on find command in T15038

Test Plan: Validate

Reviewers: int-index, osa1

Reviewed By: osa1

Subscribers: rwbarton, thomie, carter

GHC Trac Issues: #15038

Differential Revision: https://phabricator.haskell.org/D4723

testsuite/tests/codeGen/should_run/T15038/Makefile

@@ -4,6 +4,12 @@ include $(TOP)/mk/test.mk
 
 .PHONY: T15038
 T15038:
-	'$(TEST_HC)' $(TEST_HC_OPTS) $(shell find . -iname '*.hs') -O2 -o Main \
+	'$(TEST_HC)' $(TEST_HC_OPTS)  -O2 -o Main \
+	  ./test/Main.hs \
+	  ./test/Parser.hs \
+	  ./src/Packed/Bytes/Stream/ST.hs \
+	  ./src/Packed/Bytes/Parser.hs \
+	  ./src/Packed/Bytes.hs \
+	  ./common/Data/Trie/Naive.hs \
 		-package containers -package ghc-prim -package primitive
 	./Main