Delete eztime_poem (#2308)

b/320398326

Test-On-Device: true

cobalt/build/cobalt_configuration.py

@@ -141,7 +141,6 @@ def GetTestTargets(self):
         'overlay_info_test',
         'persistent_settings_test',
         'png_utils_test',
-        'poem_unittests',
         'js_profiler_test',
         'renderer_test',
         'render_tree_test',

starboard/BUILD.gn

@@ -25,7 +25,6 @@ group("gn_all") {
     "//starboard/client_porting/eztime",
     "//starboard/client_porting/eztime:eztime_test",
     "//starboard/client_porting/icu_init",
-    "//starboard/client_porting/poem:poem_unittests",
     "//starboard/examples/hello_world:starboard_hello_world_example",
     "//starboard/examples/window:starboard_window_example",
     "//starboard/extension:extension_test",

starboard/client_porting/README.md

@@ -4,32 +4,6 @@ This Starboard sub-project contains libraries and headers that can be used to
 make porting client software on top of Starboard a little easier.
 
 
-# "Poem" - Lightweight POSIX Emulation
-
-Before Starboard, we had tried to build a POSIX emulation layer for every
-platform we wanted to support. This meant replacing link symbols in some cases,
-and a wielding global preprocessor macros in others. It was impossible to keep
-inclusion of platform headers (e.g. `winsock.h`) from transitively leaking out
-into common code.
-
-`poem`, for POsix EMulation, is somewhat similar, but a surgical tool for
-targeted porting, rather than a blunt instrument. Because we have Starboard as a
-well-defined barrier, we can use the preprocessor to selectively redirect
-standard functions like malloc to Starboard without making lots of changes to
-the code.
-
-The rule we use is that these headers must ONLY be included in implementation
-files, not headers, so that the preprocessor replacements don't spread
-uncontrollably.
-
-For each `poem`, we try to name files in a consistent, formulaic manner.  With
-this scheme, we can easily determine the correct poem header while porting.
-This can also come handy if one were to write a script to assist in porting
-third party libraries.  In theory, the script would just look for includes
-in .cc files, where we have available poems and then wrap unprotected includes
-in #if !defined(STARBOARD), and include the poems if STARBOARD is defined.
-
-
 # "eztime" - Easy Time Functions
 
 Starboard does not contain functions that do much in the way of time
@@ -39,6 +13,4 @@ ICU and Starboard that makes it easy to replace calls to functions like mktime
 and gmtime in older C libraries with more robust ICU calls.
 
 EzTime can be used directly by including
-`starboard/client_porting/eztime/eztime.h`, or you can include
-`starboard/client_porting/poem/eztime_poem.h` in your implementation file to
-automatically simulate POSIXy time functions.
+`starboard/client_porting/eztime/eztime.h`.