ensure test value is a REAL4
Description
When building under conda the following warning is encountered:
/Users/runner/miniforge3/conda-bld/lal-split_1611840399916/work/test/support/UserInputParseTest.c:162:17: error: implicit conversion from 'int' to 'REAL4' (aka 'float') changes value from 2147483647 to 2147483648 [-Werror,-Wimplicit-const-int-float-conversion]
valREAL4Ref = 2147483647;
~ ^~~~~~~~~~
this is addressed by explicitly making varREAL4Ref
a floating point number to avoid the implicit conversion.
API Changes and Justification
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