build: add additional target exports for static linking

When building tools-support-core using statically linked libraries, we
need to export additional targets to ensure that the full closure is
available to consumers.This is meant to support building swift-driver
against a statically linked form of tools-support-core to allow using
the early swift-driver on Windows.

Author: compnerd

Sources/TSCLibc/CMakeLists.txt

@@ -12,3 +12,5 @@ add_library(TSCLibc STATIC
 # NOTE(compnerd) workaround for CMake not setting up include flags yet
 set_target_properties(TSCLibc PROPERTIES
   INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
+
+set_property(GLOBAL APPEND PROPERTY TSC_EXPORTS TSCLibc)