qt6.qtbase: remove valgrind from propagatedBuildInputs

reduces the build-time closure and the runtime closure of packages accidentally referencing qtbase.dev by nearly 600M

Nick Cao 60f6a46b 180a5d76

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-2
pkgs/development/libraries/qt-6/modules/qtbase.nix
··· 31 31 , libsepol 32 32 , vulkan-headers 33 33 , vulkan-loader 34 - , valgrind 35 34 , libthai 36 35 , libdrm 37 36 , libdatrie ··· 140 139 libthai 141 140 libdrm 142 141 libdatrie 143 - valgrind 144 142 udev 145 143 # Text rendering 146 144 fontconfig