[libunwind] Switch to add_llvm_install_targets

This gains us the install-unwind-stripped target, to perform stripping
during installation.

Differential Revision: https://reviews.llvm.org/D40685

llvm-svn: 319498

libunwind/src/CMakeLists.txt

@@ -139,9 +139,7 @@ if (LIBUNWIND_INSTALL_LIBRARY)
 endif()
 
 if (NOT CMAKE_CONFIGURATION_TYPES AND LIBUNWIND_INSTALL_LIBRARY)
-  add_custom_target(install-unwind
-    DEPENDS unwind
-    COMMAND "${CMAKE_COMMAND}"
-            -DCMAKE_INSTALL_COMPONENT=unwind
-            -P "${LIBUNWIND_BINARY_DIR}/cmake_install.cmake")
+  add_llvm_install_targets(install-unwind
+                           DEPENDS unwind
+                           COMPONENT unwind)
 endif()