Use BSD grep for builds with toybox

- Include symlinks for egrep and fgrep

Change-Id: I78e27f95efa143fa63def02c9e72af567833aefe

prebuilt/Android.mk

@@ -21,6 +21,11 @@ else
     RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/sh
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libcrypto.so
     ifeq ($(shell test $(PLATFORM_SDK_VERSION) -ge 23; echo $$?),0)
+        RELINK_SOURCE_FILES += $(TARGET_OUT_EXECUTABLES)/grep
+        LOCAL_POST_INSTALL_CMD += $(hide) if [ -e "$(TARGET_RECOVERY_ROOT_OUT)/sbin/egrep" ]; then \
+                                    rm $(TARGET_RECOVERY_ROOT_OUT)/sbin/egrep; fi; ln -sr $(TARGET_RECOVERY_ROOT_OUT)/sbin/grep $(TARGET_RECOVERY_ROOT_OUT)/sbin/egrep; \
+                                    if [ -e "$(TARGET_RECOVERY_ROOT_OUT)/sbin/fgrep" ]; then \
+                                    rm $(TARGET_RECOVERY_ROOT_OUT)/sbin/fgrep; fi; ln -sr $(TARGET_RECOVERY_ROOT_OUT)/sbin/grep $(TARGET_RECOVERY_ROOT_OUT)/sbin/fgrep;
         RELINK_SOURCE_FILES += $(TARGET_RECOVERY_ROOT_OUT)/sbin/toybox
         ifneq ($(wildcard external/zip/Android.mk),)
             RELINK_SOURCE_FILES += $(TARGET_OUT_OPTIONAL_EXECUTABLES)/zip

toybox/Android.mk

@@ -481,15 +481,12 @@ ALL_TOOLS += \
     dd \
     df \
     diff \
-    egrep \
-    fgrep \
     flock \
     freeramdisk \
     fsfreeze \
     fstype \
     ftpget \
     ftpput \
-    grep \
     help \
     install \
     ionice \