crt: tests: document broken test t_try1

Signed-off-by: Kirill Makurin <maiddaisuki@outlook.com>
Signed-off-by: LIU Hao <lh_mouse@126.com>

mingw-w64-crt/testcases/Makefile.am

diff --git a/mingw-w64-crt/testcases/Makefile.am b/mingw-w64-crt/testcases/Makefile.am
index 3e230fb..1bf8f5a 100644
--- a/mingw-w64-crt/testcases/Makefile.am
+++ b/mingw-w64-crt/testcases/Makefile.am
@@ -14,6 +14,11 @@
   t_intrin_cpp \
   t_winmain
 
+# FIXME:
+#
+# t_try1.cpp: this test is completely broken as it uses broken macros `__try1`
+#  and `__except1` from exept.h.
+
 # Note that this list is usually sorted in alphabetical order.
 # An exception is when variants of the same test are grouped together.
 testcase_progs = \