clean up experimental setup and keep using ffast-math flag

Summary: Remove experimental setup of fast-math and add `-ffast-math` as a compiler flag for yoga.

Reviewed By: emilsjolander

Differential Revision: D7414228

fbshipit-source-id: 320e1b1953f6af867b13e617af7872eb8999160e

BUCK

@@ -32,20 +32,6 @@ cxx_library(
     ],
 )
 
-cxx_library(
-    name = "yogafastmath",
-    srcs = glob(["yoga/*.cpp"]),
-    header_namespace = "",
-    exported_headers = subdir_glob([("", "yoga/*.h")]),
-    compiler_flags = COMPILER_FLAGS + ["-ffast-math"],
-    soname = "libyogafastmathcore.$(ext)",
-    tests = [":YogaTests"],
-    visibility = ["PUBLIC"],
-    deps = [
-        yoga_dep("lib/fb:ndklog"),
-    ],
-)
-
 cxx_test(
     name = "YogaTests",
     srcs = glob(["tests/*.cpp"]),