Build: Add architecture rule for libshared.a.

- As suggested by Ingo, add libshared.a to the architecture name map.
  This allows it to be linked by its short name like other frequently
  used libraries.
- Adjust all Jamfiles referencing the lib accordingly.

build/jam/ArchitectureRules

@@ -198,6 +198,8 @@ rule ArchitectureSetup architecture
 	}
 	HAIKU_LIBRARY_NAME_MAP_$(architecture)_localestub
 		= <$(architecture)>liblocalestub.a ;
+	HAIKU_LIBRARY_NAME_MAP_$(architecture)_shared
+		= <$(architecture)>libshared.a ;
 	if $(architecture) = $(HAIKU_PACKAGING_ARCHS[1]) {
 		HAIKU_LIBRARY_NAME_MAP_$(architecture)_input_server
 			= <nogrist>input_server ;

build/jam/packages/HaikuDevel

@@ -39,7 +39,7 @@ for lib in [ HaikuImageGetSystemLibs ] $(developmentLibs) {
 
 # static libraries
 AddFilesToPackage develop lib : libcolumnlistview.a
-	<$(architecture)>liblocalestub.a libshared.a ;
+	<$(architecture)>liblocalestub.a <$(architecture)>libshared.a ;
 
 # the POSIX error code mapper library
 AddFilesToPackage develop lib : libposix_error_mapper.a ;