nanosaur,nanosaur2,otto-matic: cleanup cmake build

Use the standard way of building cmake projects. This also removes the
unnecessary build files from the output.

pkgs/games/nanosaur/default.nix

@@ -20,21 +20,12 @@ stdenv.mkDerivation rec {
     SDL2
   ];
 
-  configurePhase = ''
-    runHook preConfigure
-    cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
-    runHook postConfigure
-  '';
-
-  buildPhase = ''
-    runHook preBuild
-    cmake --build build
-    runHook postBuild
-  '';
+  cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" ];
 
   installPhase = ''
     runHook preInstall
-    mv build $out
+    mkdir -p "$out/bin"
+    mv Nanosaur Data ReadMe.txt "$out/"
     makeWrapper $out/Nanosaur $out/bin/Nanosaur --chdir "$out"
     runHook postInstall
   '';

pkgs/games/nanosaur2/default.nix

@@ -20,21 +20,12 @@ stdenv.mkDerivation rec {
     SDL2
   ];
 
-  configurePhase = ''
-    runHook preConfigure
-    cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
-    runHook postConfigure
-  '';
-
-  buildPhase = ''
-    runHook preBuild
-    cmake --build build
-    runHook postBuild
-  '';
+  cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" ];
 
   installPhase = ''
     runHook preInstall
-    mv build $out
+    mkdir -p "$out/bin"
+    mv Nanosaur2 Data ReadMe.txt "$out/"
     makeWrapper $out/Nanosaur2 $out/bin/Nanosaur2 --chdir "$out"
     runHook postInstall
   '';

pkgs/games/otto-matic/default.nix

@@ -12,22 +12,23 @@ stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
-  buildInputs = [
-    SDL2
-  ];
-
   nativeBuildInputs = [
     cmake
     makeWrapper
   ];
 
+  buildInputs = [
+    SDL2
+  ];
+
+  cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release" ];
+
   installPhase = ''
     runHook preInstall
 
-    mkdir -p $out/share/OttoMatic
-    mv Data $out/share/OttoMatic
-    install -Dm755 {.,$out/bin}/OttoMatic
-    wrapProgram $out/bin/OttoMatic --chdir "$out/share/OttoMatic"
+    mkdir -p "$out/bin"
+    mv OttoMatic Data ReadMe.txt "$out/"
+    makeWrapper $out/OttoMatic $out/bin/OttoMatic --chdir "$out"
 
     runHook postInstall
   '';