Add functions to list of exported functions

Additionally export the following fuctions (to make trab_config build again):
- simple_strtol()
- strcmp()

Also bump the ABI version to reflect this change

Signed-off-by: Martin Krause <martin.krause@tqs.de>
diff --git a/include/_exports.h b/include/_exports.h
index a0fbf2a..da6e088 100644
--- a/include/_exports.h
+++ b/include/_exports.h
@@ -15,6 +15,8 @@
 EXPORT_FUNC(getenv)
 EXPORT_FUNC(setenv)
 EXPORT_FUNC(simple_strtoul)
+EXPORT_FUNC(simple_strtol)
+EXPORT_FUNC(strcmp)
 #if defined(CONFIG_CMD_I2C)
 EXPORT_FUNC(i2c_write)
 EXPORT_FUNC(i2c_read)