testsuite: use -fhide-source-paths to normalise some backpack tests

(cherry picked from commit b19de476)

testsuite/tests/backpack/should_compile/all.T

@@ -8,7 +8,7 @@ test('bkp11', normal, backpack_compile, [''])
 test('bkp12', normal, backpack_compile, [''])
 test('bkp14', normal, backpack_compile, [''])
 test('bkp15', normal, backpack_compile, [''])
-test('bkp16', normalise_version('base', 'ghc-internal'), backpack_compile, [''])
+test('bkp16', [normalise_version('base', 'ghc-internal')], backpack_compile, ['-fhide-source-paths'])
 test('bkp17', normal, backpack_compile, [''])
 test('bkp18', normal, backpack_compile, [''])
 test('bkp19', normal, backpack_compile, [''])
@@ -60,4 +60,4 @@ test('T13214', normal, backpack_compile, [''])
 test('T13250', normal, backpack_compile, [''])
 test('T13323', normal, backpack_compile, [''])
 test('T20396', normal, backpack_compile, [''])
-test('T23424', [ignore_stdout, ignore_stderr], backpack_compile, ['-ddump-rn-trace -ddump-if-trace -ddump-tc-trace'])
\ No newline at end of file
+test('T23424', [ignore_stdout, ignore_stderr], backpack_compile, ['-ddump-rn-trace -ddump-if-trace -ddump-tc-trace'])

testsuite/tests/backpack/should_compile/bkp16.stderr

 [1 of 2] Processing p
-  [1 of 1] Compiling Int[sig]         ( p/Int.hsig, nothing )
+  [1 of 1] Compiling Int[sig]
 [2 of 2] Processing q
   Instantiating q
   [1 of 1] Including p[Int=base-4.20.0.0:GHC.Exts]
     Instantiating p[Int=base-4.20.0.0:GHC.Exts]
     [1 of 1] Including base-4.20.0.0
-    [1 of 1] Compiling Int[sig]         ( p/Int.hsig, bkp16.out/p/p-3JmGAx0a1DyKjX6bh7CxGJ/Int.o )
+    [1 of 1] Compiling Int[sig]
   [1 of 1] Instantiating p

testsuite/tests/backpack/should_fail/all.T

@@ -12,9 +12,9 @@ test('bkpfail13', normal, backpack_compile_fail, [''])
 test('bkpfail14', normal, backpack_compile_fail, [''])
 test('bkpfail15', normal, backpack_compile_fail, [''])
 test('bkpfail16', normalise_version('ghc-internal', 'base'), backpack_compile_fail, [''])
-test('bkpfail17', normalise_version('ghc-internal', 'base'), backpack_compile_fail, [''])
+test('bkpfail17', normalise_version('ghc-internal', 'base'), backpack_compile_fail, ['-fhide-source-paths'])
 test('bkpfail18', normal, backpack_compile_fail, [''])
-test('bkpfail19', normalise_version('ghc-internal', 'base'), backpack_compile_fail, [''])
+test('bkpfail19', normalise_version('ghc-internal', 'base'), backpack_compile_fail, ['-fhide-source-paths'])
 test('bkpfail20', normal, backpack_compile_fail, [''])
 test('bkpfail21', normal, backpack_compile_fail, [''])
 test('bkpfail22', normal, backpack_compile_fail, [''])

testsuite/tests/backpack/should_fail/bkpfail17.stderr

 [1 of 2] Processing p
-  [1 of 1] Compiling ShouldFail[sig]  ( p/ShouldFail.hsig, nothing )
+  [1 of 1] Compiling ShouldFail[sig]
 [2 of 2] Processing q
   Instantiating q
   [1 of 1] Including p[ShouldFail=base-4.20.0.0:Prelude]
     Instantiating p[ShouldFail=base-4.20.0.0:Prelude]
-    [1 of 1] Compiling ShouldFail[sig]  ( p/ShouldFail.hsig, bkpfail17.out/p/p-9R9TTjIBG3MEjwCQffKVYM/ShouldFail.o )
+    [1 of 1] Compiling ShouldFail[sig]
 <no location info>: error: [GHC-15843]
     • Type constructor ‘Either’ has conflicting definitions in the module
       and its hsig file.

testsuite/tests/backpack/should_fail/bkpfail19.stderr

 [1 of 2] Processing p
-  [1 of 1] Compiling ShouldFail[sig]  ( p/ShouldFail.hsig, nothing )
+  [1 of 1] Compiling ShouldFail[sig]
 [2 of 2] Processing q
   Instantiating q
   [1 of 1] Including p[ShouldFail=base-4.20.0.0:Data.STRef]
     Instantiating p[ShouldFail=base-4.20.0.0:Data.STRef]
-    [1 of 1] Compiling ShouldFail[sig]  ( p/ShouldFail.hsig, bkpfail19.out/p/p-Gwl8Z2CPH0M7Zi2wPSYSbs/ShouldFail.o )
+    [1 of 1] Compiling ShouldFail[sig]
 <no location info>: error: [GHC-12424]
     • The hsig file (re)exports ‘Data.STRef.Lazy.newSTRef’
       but the implementing module exports a different identifier ‘GHC.Internal.STRef.newSTRef’