stop using internal libs (stack poorly supports them)

This worked fine when working on the executables, but not on the lib
itself (which was not listed in `stack ide targets` or the target
supported in `stack build
advent-of-code-y2021:lib:advent-of-code-inputs`).

An issue is still open at the moment:
commercialhaskell/stack#4564

Author: cebamps

advent-of-code-y2021.cabal

@@ -1,4 +1,4 @@
-cabal-version: 2.0
+cabal-version: 1.12
 
 -- This file has been generated from package.yaml by hpack version 0.34.4.
 --
@@ -8,13 +8,13 @@ name:           advent-of-code-y2021
 version:        0.1.0.0
 build-type:     Simple
 
-library advent-of-code-inputs
+library
   exposed-modules:
       Input.D01
   other-modules:
       Paths_advent_of_code_y2021
   hs-source-dirs:
-      data/
+      src
   build-depends:
       base >=4.7 && <5
   default-language: Haskell2010
@@ -26,6 +26,6 @@ executable d01
   hs-source-dirs:
       exe
   build-depends:
-      advent-of-code-inputs
+      advent-of-code-y2021
     , base >=4.7 && <5
   default-language: Haskell2010

package.yaml

@@ -4,16 +4,11 @@ version:             0.1.0.0
 dependencies:
   - base >= 4.7 && < 5
 
-## commented out until i have shared tools
-#library:
-#  source-dirs:      src
-
-internal-libraries:
-  advent-of-code-inputs:
-    source-dirs: data/
+library:
+  source-dirs:      src
 
 executables:
   d01:
     source-dirs: exe
     main: d01.hs
-    dependencies: advent-of-code-inputs
+    dependencies: advent-of-code-y2021