Remove EXPAND/STRINGIFY macros.

They are error-prone by putting anything into a string (e.g.
EXPAND(RECOVERY_API_VERSION) would become "RECOVER_API_VERSION" if we
forgot to pass -DRECOVERY_API_VERSION=3).

RECOVERY_API_VERSION is the only user (in bootable/recovery) that gets
stringified. Assign it to a typed var and sanity check the value.

Don't see other reference to the macros from device-specific recovery
directories (they can still define that locally if really needed).

Test: recovery_component_test
Test: Sideload an OTA on angler and marlin respectively.
Change-Id: I358bbdf8f0a99db5ce4c7bc2fdcafe8013501b64

common.h

@@ -22,8 +22,8 @@
 
 #include <string>
 
-#define STRINGIFY(x) #x
-#define EXPAND(x) STRINGIFY(x)
+static constexpr int kRecoveryApiVersion = RECOVERY_API_VERSION;  // Defined in Android.mk.
+static_assert(kRecoveryApiVersion >= 3, "Invalid recovery API version.");
 
 class RecoveryUI;
 

install.cpp

@@ -287,7 +287,7 @@ int update_binary_command(const std::string& path, ZipArchiveHandle zip, int ret
 
   *cmd = {
     binary,
-    EXPAND(RECOVERY_API_VERSION),  // defined in Android.mk
+    std::to_string(kRecoveryApiVersion),
     std::to_string(status_fd),
     path,
   };

recovery.cpp

@@ -1501,7 +1501,7 @@ int main(int argc, char **argv) {
     property_list(print_property, NULL);
     printf("\n");
 
-    ui->Print("Supported API: %d\n", RECOVERY_API_VERSION);
+    ui->Print("Supported API: %d\n", kRecoveryApiVersion);
 
     int status = INSTALL_SUCCESS;