* added support for library (API-)versioning and private system libraries to

build system
* declared ICU-libs as private system libraries, which causes them to no longer
  be available for building software (they no longer are linked from the 
  development lib folder, so the linker won't find them)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35323 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/jam/MainBuildRules

@@ -429,11 +429,17 @@ rule SharedLibrary
 	local sources = [ FGristFiles $(2) ] ;
 	local objects = $(sources:S=$(SUFOBJ)) ;
 	local libs = $(3) ;
+	local apiVersion = $(4) ;
 
 	if ! [ IsPlatformSupportedForTarget $(1) ] {
 		return ;
 	}
 
+	if $(apiVersion) {
+		HAIKU_SONAME on $(lib) = $(lib:BS).$(apiVersion) ;
+		HAIKU_LIB_API_VERSION on $(lib) = $(apiVersion) ;
+	}
+
 	InheritPlatform $(objects) : $(lib) ;
 	Objects $(sources) ;
 	SharedLibraryFromObjects $(lib) : $(objects) : $(libs) ;