The rx port has a bunch of what I presume are ABI compatibility functions in
libgcc. Those compatibility functions routines such as __eqdf2 from libgcc,
but without a prototype. This patch adds the missing prototypes.
libgcc/
* config/rx/rx-abi-functions.c (__ltdf2, __gtdf2): Add prototype.
(__ledf2, __gedf2, __eqdf2, __nedf2): Likewise.
(__ltsf2, __gtsf2, __lesf2, __gesf2, __eqsf2, __nesf2): Likewise.