add after_install

Author: waruqi

src/foo/xmake.sh

@@ -6,3 +6,10 @@ target "foo"
     add_defines "FOO" "{public}"
     add_undefines "BAZ" "{public}"
     add_includedirs "." "{public}"
+    after_install "foo_after_install"
+
+foo_after_install() {
+    local target=${1}
+    local installdir=${2}
+    echo "after installing ${target} ${installdir}"
+}