Testsuite: fix T11223_simple_(unused_)duplicate_lib

These tests were failing on Travis when run independently from
eachother.

testsuite/tests/rts/T11223/Makefile

@@ -34,7 +34,7 @@ t_11223_simple_duplicate_lib:
 	"$(CC)" -c foo.c -o foo_dup_lib.o
 	"$(CC)" -c bar.c -o bar_dup_lib.o
 	"$(AR)" rs libfoo_dup_lib.a foo_dup_lib.o 2> /dev/null
-	echo main | "$(TEST_HC)" --interactive -v0 $(filter-out -rtsopts, $(TEST_HC_OPTS)) -ignore-dot-ghci bar_dup.o foo.hs -lfoo_dup_lib -L"$(PWD)"
+	echo main | "$(TEST_HC)" --interactive -v0 $(filter-out -rtsopts, $(TEST_HC_OPTS)) -ignore-dot-ghci bar_dup_lib.o foo.hs -lfoo_dup_lib -L"$(PWD)"
 
 .PHONY: t_11223_simple_unused_duplicate_lib
 t_11223_simple_unused_duplicate_lib:
@@ -42,7 +42,7 @@ t_11223_simple_unused_duplicate_lib:
 	"$(CC)" -c foo.c -o foo_dup_lib.o
 	"$(CC)" -c bar.c -o bar_dup_lib.o
 	"$(AR)" rs libbar_dup_lib.a bar_dup_lib.o 2> /dev/null
-	echo main | "$(TEST_HC)" --interactive -v0 $(filter-out -rtsopts, $(TEST_HC_OPTS)) -ignore-dot-ghci foo_dup.o foo.hs -lbar_dup_lib -L"$(PWD)"
+	echo main | "$(TEST_HC)" --interactive -v0 $(filter-out -rtsopts, $(TEST_HC_OPTS)) -ignore-dot-ghci foo_dup_lib.o foo.hs -lbar_dup_lib -L"$(PWD)"
 
 .PHONY: t_11223_link_order_a_b_succeed
 t_11223_link_order_a_b_succeed:

testsuite/tests/rts/T11223/T11223_simple_duplicate_lib.stderr

@@ -3,7 +3,7 @@ GHC runtime linker: fatal error: I found a duplicate definition for symbol
 whilst processing object file
    /home/phyx/Documents/ghc/testsuite/tests/rts/T11223/libfoo_dup_lib.a
 The symbol was previously defined in
-   bar_dup.o
+   bar_dup_lib.o
 This could be caused by:
    * Loading two different object files which export the same symbol
    * Specifying the same object file twice on the GHCi command line

testsuite/tests/rts/T11223/foo2.hs

 module Main where
 
-foreign import ccall "a" c_exp :: Int
+foreign import ccall "a" a_exp :: Int
 
-main = print c_exp
+main = print a_exp