Move back to BSD grep, and make it available for recovery too.

Bug: http://b/111849261
Bug: https://bugs.exim.org/show_bug.cgi?id=2294
Test: manual
Change-Id: Ia4f67b9f803c4f039d170f6d015a1bd2bb0ef23d

shell_and_utilities/Android.bp

@@ -27,6 +27,7 @@ phony {
 phony {
     name: "shell_and_utilities_recovery",
     required: [
+        "grep.recovery",
         "sh.recovery",
         "toolbox.recovery",
         "toybox.recovery",

toolbox/Android.bp

@@ -62,8 +62,8 @@ cc_binary {
 }
 
 // We build BSD grep separately (but see http://b/111849261).
-cc_binary {
-    name: "grep",
+cc_defaults {
+    name: "grep_common",
     defaults: ["toolbox_defaults"],
     srcs: [
         "upstream-netbsd/usr.bin/grep/fastgrep.c",
@@ -72,8 +72,27 @@ cc_binary {
         "upstream-netbsd/usr.bin/grep/queue.c",
         "upstream-netbsd/usr.bin/grep/util.c",
     ],
-
+    symlinks: [
+        "egrep",
+        "fgrep",
+    ],
     sanitize: {
         integer_overflow: false,
     },
 }
+
+cc_binary {
+    name: "grep",
+    defaults: ["grep_common"],
+    recovery_available: true,
+}
+
+// Build vendor grep.
+// TODO: Add vendor_available to "grep" module and remove "grep_vendor" module
+//       when vendor_available is fully supported.
+cc_binary {
+    name: "grep_vendor",
+    stem: "grep",
+    vendor: true,
+    defaults: ["grep_common"],
+}