Add back usint/usshort/uschar typedefs for external project backwards compatibility (#1219)

Author: pascoec

src/core/include/utils/inttypes.h

@@ -41,6 +41,21 @@
 #include <cstdint>
 #include <iosfwd>
 
+/**
+ * @brief Type used for representing unsigned 8-bit integers.
+ */
+typedef uint8_t uschar;
+
+/**
+ * @brief Type used for representing unsigned 16-bit short integers.
+ */
+typedef uint16_t usshort;
+
+/**
+ * @brief Type used for representing unsigned 32-bit integers.
+ */
+typedef uint32_t usint;
+
 typedef uint64_t PlaintextModulus;
 
 /**