pkg/csource: allow to ignore warnings during build

Running bisection using an older repro failed with:

    <stdin>: In function ‘syz_mount_image.constprop’:
    <stdin>:298:3: error: argument 1 null where non-null expected [-Werror=nonnull]
    In file included from <stdin>:26:0:
    /usr/include/x86_64-linux-gnu/sys/stat.h:320:12: note: in a call to function ‘mkdir’ declared here
     extern int mkdir (const char *__path, __mode_t __mode)

Let's be safe and ignore warnings during repro/bisect.
Everything that runs during tests still has all warnings.

Update #501

1 files changed, 1 insertions, 1 deletions

diff --git a/pkg/repro/repro.go b/pkg/repro/repro.go
index 2c6a0e6ed..7aafdde31 100644
--- a/pkg/repro/repro.go
+++ b/pkg/repro/repro.go
@@ -556,7 +556,7 @@ func (ctx *context) testCProg(p *prog.Prog, duration time.Duration, opts csource
 	if err != nil {
 		return false, err
 	}
-	bin, err := csource.Build(p.Target, src)
+	bin, err := csource.BuildNoWarn(p.Target, src)
 	if err != nil {
 		return false, err
 	}