MBEDTLS_NO_UDBL_DIVISION macro

\def MBEDTLS_NO_UDBL_DIVISION The platform lacks support for double-width integer division (64-bit division on a 32-bit platform, 128-bit division on a 64-bit platform). Used in: include/mbedtls/bignum.h library/bignum.c The bignum code uses double-width division to speed up some operations. Double-width division is often implemented in software that needs to be linked with the program. The presence of a double-width integer type is usually detected automatically through preprocessor macros, but the automatic detection cannot know whether the code needs to and can be linked with an implementation of division for that type. By default division is assumed to be usable if the type is present. Uncomment this option to prevent the use of double-width division. Note that division for the native integer type is always required. Furthermore, a 64-bit type is always required even on a 32-bit platform, but it need not support multiplication or division. In some cases it is also desirable to disable some double-width operations. For example, if double-width division is implemented in software, disabling it can reduce code size in some embedded targets.