Replace -Weverything with -Wextra

-Weverything is not recommended, use -Wextra.

Requires adding a few more disabled warnings to libvulkan,
-Weverything appears to not turn on warnings that were disabled
by earlier command line arguments, while -Wextra does.

Bug: 143713277
Test: m native
Change-Id: I3997c2afe094deca66018e3cc43921aaecd82028
diff --git a/vulkan/libvulkan/Android.bp b/vulkan/libvulkan/Android.bp
index b0c4f3f..4d6b2be 100644
--- a/vulkan/libvulkan/Android.bp
+++ b/vulkan/libvulkan/Android.bp
@@ -41,12 +41,13 @@
         "-DVK_NO_PROTOTYPES",
         "-fvisibility=hidden",
         "-fstrict-aliasing",
-        "-Weverything",
+        "-Wextra",
         "-Werror",
         "-Wno-padded",
+        "-Wno-sign-compare",
         "-Wno-switch-enum",
-        "-Wno-undef",
-        "-Wno-format-pedantic",
+        "-Wno-unused-variable",
+        "-Wno-unused-function",
 
         // Have clang emit complete debug_info.
         "-fstandalone-debug",