MinGW compiler warnings in ecpg tests

Under MinGW, when compiling the ecpg test files, you get these warnings:

sqlda.pgc: In function 'dump_sqlda':
sqlda.pgc:44:11: warning: unknown conversion type character 'l' in format [-Wformat=]
printf("name sqlda descriptor: '%s' value %lld\n", sqlda->sqlvar[i].sqlname.data, *(long long int *)sqlda->sqlvar[i].sqldata);
sqlda.pgc:44:11: warning: too many arguments for format [-Wformat-extra-args]
sqlda.pgc:44:11: warning: unknown conversion type character 'l' in format [-Wformat=]
sqlda.pgc:44:11: warning: too many arguments for format [-Wformat-extra-args]

These files don't use our printf replacement or the c.h porting layer,
so unless we want to start doing that, I propose the attached patch to
determine the appropriate format conversion the hard way.

--
Peter Eisentraut http://www.2ndQuadrant.com/
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