depends: strip when installing qt

Otherwise we end up with ~1.5GB of binaries (Linux) when DEBUG=1..

Author: fanquake

depends/packages/native_qt.mk

@@ -147,7 +147,7 @@ define $(package)_build_cmds
 endef
 
 define $(package)_stage_cmds
-  cmake --install . --prefix $($(package)_staging_prefix_dir)
+  cmake --install . --prefix $($(package)_staging_prefix_dir) --strip
 endef
 
 define $(package)_postprocess_cmds

depends/packages/qt.mk

@@ -278,7 +278,7 @@ define $(package)_build_cmds
 endef
 
 define $(package)_stage_cmds
-  cmake --install . --prefix $($(package)_staging_prefix_dir)
+  cmake --install . --prefix $($(package)_staging_prefix_dir) --strip
 endef
 
 define $(package)_postprocess_cmds