[four-in-a-row/KaKnife/four-in-a-row-vala] Disable C compiler warnings

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5cc783c655738b7c62728b6e00d41b1a09b050a1
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Dec 15 21:33:31 2018 -0600

    Disable C compiler warnings
    
    It's not useful to see C compiler warnings, because we can't do anything
    about them. Vala is responsible for generating correct C.

 src/Makefile.am | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 1eb22bc..fff6af6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -23,7 +23,8 @@ four_in_a_row_CFLAGS = \
        -DSOUND_DIRECTORY=\"$(datadir)/four-in-a-row/sounds\" \
        -DLOCALEDIR=\"$(datadir)/locale\" \
        -DICON_THEME_DIRECTORY="\"$(datadir)/icons\"" \
-       $(FOUR_IN_A_ROW_CFLAGS)
+       $(FOUR_IN_A_ROW_CFLAGS) \
+       -w
 
 four_in_a_row_LDADD = \
        $(FOUR_IN_A_ROW_LIBS)