Unused variables in DataTypesTest.cpp

[grnydawn]

"Omega/components/omega/test/base/DataTypesTest.cpp", line 36: warning: variable "MyInt4" was set but never used [set_but_not_used]
"Omega/components/omega/test/base/DataTypesTest.cpp", line 37: warning: variable "MyInt8" was set but never used [set_but_not_used]
"Omega/components/omega/test/base/DataTypesTest.cpp", line 38: warning: variable "MyR4" was set but never used [set_but_not_used]
"Omega/components/omega/test/base/DataTypesTest.cpp", line 39: warning: variable "MyR8" was set but never used [set_but_not_used]
"Omega/components/omega/test/base/DataTypesTest.cpp", line 40: warning: variable "MyReal" was set but never used [set_but_not_used]
"Omega/components/omega/test/base/DataTypesTest.cpp", line 42: warning: variable "MyRealLiteral" was set but never used [set_but_not_used]

[philipwjones]

Closed via #267