tests/fp: Do not emit implicit-fallthrough warnings in the softfloat …

…tests

The softfloat tests are external repositories, so we do not care
about implicit fallthrough warnings in this code.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Chen Qun <kuhn.chenqun@huawei.com>
Message-Id: <20201211152426.350966-12-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/fp/meson.build

@@ -27,6 +27,7 @@ tfdir = 'berkeley-testfloat-3/source'
 sfinc = include_directories(sfdir / 'include', sfspedir)
 
 tfcflags = [
+  '-Wno-implicit-fallthrough',
   '-Wno-strict-prototypes',
   '-Wno-unknown-pragmas',
   '-Wno-uninitialized',
@@ -209,6 +210,7 @@ libtestfloat = static_library(
 )
 
 sfcflags = [
+  '-Wno-implicit-fallthrough',
   '-Wno-missing-prototypes',
   '-Wno-redundant-decls',
   '-Wno-return-type',