Display --bit-depth in -h with highbitdepth enabled.

Display the -b --bit-depth command line parameter on of aomenc when
 --config-aom-highbitdepth is enabled.

Change-Id: I76147e38b9985e68b1e642e21be8fd4d8ec4d966

aomenc.c

diff --git a/aomenc.c b/aomenc.c
index 9ba9301..63ef753 100644
--- a/aomenc.c
+++ b/aomenc.c
@@ -198,6 +198,17 @@
 #if CONFIG_AOM_HIGHBITDEPTH
 static const arg_def_t test16bitinternalarg = ARG_DEF(
     NULL, "test-16bit-internal", 0, "Force use of 16 bit internal buffer");
+
+static const struct arg_enum_list bitdepth_enum[] = {
+  { "8", AOM_BITS_8 }, { "10", AOM_BITS_10 }, { "12", AOM_BITS_12 }, { NULL, 0 }
+};
+
+static const arg_def_t bitdeptharg = ARG_DEF_ENUM(
+    "b", "bit-depth", 1,
+    "Bit depth for codec (8 for version <=1, 10 or 12 for version 2)",
+    bitdepth_enum);
+static const arg_def_t inbitdeptharg =
+    ARG_DEF(NULL, "input-bit-depth", 1, "Bit depth of input");
 #endif
 
 static const arg_def_t *main_args[] = { &debugmode,
@@ -270,6 +281,7 @@
                                           &error_resilient,
 #if CONFIG_AOM_HIGHBITDEPTH
                                           &test16bitinternalarg,
+                                          &bitdeptharg,
 #endif
                                           &lag_in_frames,
                                           NULL };
@@ -414,19 +426,6 @@
     ARG_DEF_ENUM(NULL, "color-space", 1, "The color space of input content:",
                  color_space_enum);
 
-#if CONFIG_AOM_HIGHBITDEPTH
-static const struct arg_enum_list bitdepth_enum[] = {
-  { "8", AOM_BITS_8 }, { "10", AOM_BITS_10 }, { "12", AOM_BITS_12 }, { NULL, 0 }
-};
-
-static const arg_def_t bitdeptharg = ARG_DEF_ENUM(
-    "b", "bit-depth", 1,
-    "Bit depth for codec (8 for version <=1, 10 or 12 for version 2)",
-    bitdepth_enum);
-static const arg_def_t inbitdeptharg =
-    ARG_DEF(NULL, "input-bit-depth", 1, "Bit depth of input");
-#endif
-
 static const struct arg_enum_list tune_content_enum[] = {
   { "default", AOM_CONTENT_DEFAULT },
   { "screen", AOM_CONTENT_SCREEN },