build, qt: Drop no longer needed workaround

hebasto · hebasto · commit 3f90ddea8a6a · 2022-04-15T21:04:42.000+02:00
The `PKG_CONFIG_LIBDIR` variable is set in `$(package)_config_env`.
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
@@ -263,7 +263,6 @@ endef
 
 define $(package)_config_cmds
   export PKG_CONFIG_SYSROOT_DIR=/ && \
-  export PKG_CONFIG_LIBDIR=$(host_prefix)/lib/pkgconfig && \
   export QT_MAC_SDK_NO_VERSION_CHECK=1 && \
   cd qtbase && \
   ./configure -top-level $($(package)_config_opts)
