Revert "qt 5.12.0 -> 5.12.3"

Segmentation faults. See https://github.com/NixOS/nixpkgs/issues/65448

This reverts commit 552803f6f5.

pkgs/development/libraries/qt-5/modules/qtbase.nix

@@ -229,8 +229,6 @@ stdenv.mkDerivation {
       "-widgets"
       "-opengl desktop"
       "-icu"
-      "-L" "${icu.out}/lib"
-      "-I" "${icu.dev}/include"
       "-pch"
     ]
     ++ lib.optionals (compareVersion "5.11.0" < 0)
@@ -267,18 +265,10 @@ stdenv.mkDerivation {
 
     ++ [
       "-system-zlib"
-      "-L" "${zlib.out}/lib"
-      "-I" "${zlib.dev}/include"
       "-system-libjpeg"
-      "-L" "${libjpeg.out}/lib"
-      "-I" "${libjpeg.dev}/include"
       "-system-harfbuzz"
-      "-L" "${harfbuzz.out}/lib"
-      "-I" "${harfbuzz.dev}/include"
       "-system-pcre"
       "-openssl-linked"
-      "-L" "${openssl.out}/lib"
-      "-I" "${openssl.dev}/include"
       "-system-sqlite"
       ''-${if mysql != null then "plugin" else "no"}-sql-mysql''
       ''-${if postgresql != null then "plugin" else "no"}-sql-psql''
@@ -307,14 +297,10 @@ stdenv.mkDerivation {
           "-system-xcb"
           "-xcb"
           "-qpa xcb"
-          "-L" "${libX11.out}/lib"
-          "-I" "${libX11.out}/include"
-          "-L" "${libXext.out}/lib"
-          "-I" "${libXext.out}/include"
-          "-L" "${libXrender.out}/lib"
-          "-I" "${libXrender.out}/include"
 
+          "-system-xkbcommon"
           "-libinput"
+          "-xkbcommon-evdev"
 
           "-no-eglfs"
           "-no-gbm"
@@ -335,19 +321,6 @@ stdenv.mkDerivation {
           "-no-feature-renameat2"
           "-no-feature-getentropy"
         ]
-        ++ lib.optionals (compareVersion "5.12.1" < 0) [
-          # use -xkbcommon and -xkbcommon-evdev for versions before 5.12.1
-          "-system-xkbcommon"
-          "-xkbcommon-evdev"
-        ]
-        ++ lib.optionals (cups != null) [
-          "-L" "${cups.lib}/lib"
-          "-I" "${cups.dev}/include"
-        ]
-        ++ lib.optionals (mysql != null) [
-          "-L" "${mysql.out}/lib"
-          "-I" "${mysql.out}/include"
-        ]
     );
 
   enableParallelBuilding = true;