.gitignore: added universal patter to ignore test binaries

src/microhttpd/.gitignore

@@ -85,3 +85,4 @@ test_postprocessor_md
 /test_str_bin_hex
 /test_dauth_userdigest
 /test_dauth_userhash
+test_*[a-z0-9_][a-z0-9_][a-z0-9_]

src/testcurl/.gitignore

@@ -177,3 +177,4 @@ core
 /test_digestauth2_bind_uri
 /test_digestauth2_oldapi1_bind_all
 /test_digestauth2_oldapi1_bind_uri
+test_*[a-z0-9_][a-z0-9_][a-z0-9_]

src/testzzuf/.gitignore

@@ -41,3 +41,4 @@
 /daemontest_get_chunked
 /daemontest_get11
 *.exe
+test_*[a-z0-9_][a-z0-9_][a-z0-9_]