Use less boost external headers dependency in shell

Change-Id: Ie9c184abe3f30b79163bed10c89f4cf76015a5aa
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156555
Tested-by: Jenkins
Reviewed-by: Gabor Kelemen <kelemeng@ubuntu.com>

shell/Executable_lngconvex.mk

@@ -9,8 +9,6 @@
 
 $(eval $(call gb_Executable_Executable,lngconvex))
 
-$(eval $(call gb_Executable_use_external,lngconvex,boost_headers))
-
 $(eval $(call gb_Executable_use_sdk_api,lngconvex))
 
 $(eval $(call gb_Executable_use_libraries,lngconvex,\

shell/IwyuFilter_shell.yaml

@@ -15,8 +15,6 @@ excludelist:
     shell/source/backends/kf5be/kf5backend.cxx:
     # Keep abstract QT headers
     - QtWidgets/QApplication
-    # Keep abstract boost headers
-    - boost/noncopyable.hpp
     shell/source/backends/localebe/localebackend.cxx:
     # Needed on WIN for toU
     - o3tl/char16_t2wchar_t.hxx

shell/Library_desktopbe.mk

@@ -9,8 +9,6 @@
 
 $(eval $(call gb_Library_Library,desktopbe1))
 
-$(eval $(call gb_Library_use_external,desktopbe1,boost_headers))
-
 $(eval $(call gb_Library_use_sdk_api,desktopbe1))
 
 $(eval $(call gb_Library_use_libraries,desktopbe1,\

shell/Library_kf5be.mk

@@ -12,7 +12,6 @@ $(eval $(call gb_Library_Library,kf5be1))
 $(eval $(call gb_Library_use_sdk_api,kf5be1))
 
 $(eval $(call gb_Library_use_externals,kf5be1,\
-	boost_headers \
 	kf5 \
 ))
 

shell/Library_losessioninstall.mk

@@ -24,7 +24,6 @@ $(eval $(call gb_Library_use_libraries,losessioninstall,\
 ))
 
 $(eval $(call gb_Library_use_externals,losessioninstall,\
-	boost_headers \
     dbus \
     gio \
 ))

shell/Library_macbe.mk

@@ -9,8 +9,6 @@
 
 $(eval $(call gb_Library_Library,macbe1))
 
-$(eval $(call gb_Library_use_external,macbe1,boost_headers))
-
 $(eval $(call gb_Library_use_sdk_api,macbe1))
 
 $(eval $(call gb_Library_use_system_darwin_frameworks,macbe1,\