libicu sometimes exports functions suffixed with the libicu version.  Given a function u_errorName, some examples seen int wild include:
libicu sometimes exports functions suffixed with the libicu version.  Given a function u_errorName, some examples seen int wild include:

u_errorName
u_errorName_44
u_errorName_4_4

This commit adds in code to check each possibility to figure out what the suffix really is.

marek-veber/ffi-icu,fantasticfears/ffi-icu,pressrelations/ffi-icu,cfis/ffi-icu,marek-veber/ffi-icu,cfis/ffi-icu,jarib/ffi-icu,jarib/ffi-icu,pressrelations/ffi-icu,fantasticfears/ffi-icu