[BUG] scripts/checkpatch.pl: incorrect parsing of commit message

[Heinrich Schuchardt]

The following text from a commit message

    "Building on RISC-V results in an error

        cc: error: ‘-march=native’: ISA string must begin with rv32 or rv64"

results in a false positive in scripts/checkpatch.pl:

    ERROR: Unrecognized email address:
    'error: ‘-march=native’: ISA string must begin with rv32 or rv64"'

If a line does not start in column 1 and does not contain an email
address, it is obviously not a Cc: tag and checkpatch.pl should not
indicate an error.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx>
---
 meson.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index 507c146..bbf4650 100644
--- a/meson.build
+++ b/meson.build
@@ -17,7 +17,10 @@ pktgen_conf = configuration_data()
 # set up some global vars for compiler, platform, configuration, etc.
 cc = meson.get_compiler('c')
 
-add_project_arguments('-march=native', language: 'c')
+target = target_machine.cpu_family()
+if (target != 'riscv64')
+    add_project_arguments('-march=native', language: 'c')
+endif
 
 if get_option('enable-avx') and cc.has_argument('-mavx')
     add_project_arguments('-mavx', language: 'c')
-- 
2.36.1