toybox: fix build in 6.0 tree

When building with TW_USE_TOOLBOX, build currently fails.
This patch fixes those build errors.

Change-Id: I041523d93a3fa9624fee80679e521750b4f9edfa

toybox/Android.mk

@@ -189,6 +189,15 @@ LOCAL_SRC_FILES := \
     toys/posix/wc.c \
     toys/posix/xargs.c
 
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -eq 26; echo $$?),0)
+# Android 8.0 had some tools in different paths
+LOCAL_SRC_FILES += \
+    toys/pending/dmesg.c
+else
+LOCAL_SRC_FILES += \
+    toys/lsb/dmesg.c
+endif
+
 ifeq ($(shell test $(PLATFORM_SDK_VERSION) -gt 23; echo $$?),0)
 # there are some conflicts here with AOSP-7.[01] and CM-14.[01]
 # the following items have been removed for compatibility
@@ -222,14 +231,6 @@ ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 27; echo $$?),0)
 LOCAL_SRC_FILES += \
     toys/pending/xzcat.c
 endif
-ifeq ($(shell test $(PLATFORM_SDK_VERSION) -eq 26; echo $$?),0)
-# Android 8.0 had some tools in different paths
-LOCAL_SRC_FILES += \
-    toys/pending/dmesg.c
-else
-LOCAL_SRC_FILES += \
-    toys/lsb/dmesg.c
-endif
 
 ifeq ($(shell test $(PLATFORM_SDK_VERSION) -gt 25; echo $$?),0)
 # Android 8.0/8.1 had some tools in different paths
@@ -319,6 +320,7 @@ LOCAL_SRC_FILES += \
 endif
 
 LOCAL_CFLAGS += \
+    -std=c99 \
     -std=gnu11 \
     -Os \
     -Wno-char-subscripts \
@@ -330,8 +332,13 @@ LOCAL_CFLAGS += \
     -ffunction-sections -fdata-sections \
     -fno-asynchronous-unwind-tables \
 
-toybox_version := $(shell sed 's/#define.*TOYBOX_VERSION.*"\(.*\)"/\1/p;d' $(LOCAL_PATH)/main.c)
-LOCAL_CFLAGS += -DTOYBOX_VERSION=\"$(toybox_version)\"
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 24; echo $$?),0)
+    toybox_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
+    LOCAL_CFLAGS += -DTOYBOX_VERSION='"$(toybox_version)"'
+else
+    toybox_version := $(shell sed 's/#define.*TOYBOX_VERSION.*"\(.*\)"/\1/p;d' $(LOCAL_PATH)/main.c)
+    LOCAL_CFLAGS += -DTOYBOX_VERSION=\"$(toybox_version)\"
+endif
 
 LOCAL_CLANG := true