gitignore: Ignore autogenerated Meson wrap files

Ignoring each autogenerated wrap file individually, to avoid
inadvertently ignoring manually created wrap files.

Although tempting, a general wildcard would not make sense here,
because, in the subprojects directory, there are also some manually
created wrap files mixed in amongst the autogenerated wrap files. (I
wonder why Meson chose to do it this way, since it goes completely
against the overall design of Meson wanting to keep the build dir
separate from the source dir.)

Tested: The directory "git status" now looks clean again.

Change-Id: I01ab21ca96a2ec4e39253e80ca135aab59a51f4d
Signed-off-by: Josh Lehan <krellan@google.com>
diff --git a/.gitignore b/.gitignore
index 327ea97..6ea014b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,12 @@
 /build*/
 /subprojects/*/
+
+# Autogenerated wrap files
+/subprojects/CLI11.wrap
+/subprojects/function2.wrap
+/subprojects/googletest.wrap
+/subprojects/ipmiblob.wrap
+/subprojects/nlohmann-json.wrap
+/subprojects/phosphor-objmgr.wrap
+/subprojects/sdeventplus.wrap
+/subprojects/stdplus.wrap