missing std:: qualifier on sqrt calls

[Stephen Clamage <stephen.clamage@…>]

File libs/numeric/ublas/test/test_complex_norms.cpp includes <cmath> and then calls sqrt twice without a std:: qualifier. Although the code works with some compilers, it is not portable. The C++ standard says that if you include a <cxxx> headaer (like <cmath>) the names in the headers are (only) in namespace std. Diffs to fix the file:

37c37
<     const double expected = sqrt(44.0);
---
>     const double expected = std::sqrt(44.0);
65c65
<     const float expected = sqrt(44.0);
---
>     const float expected = std::sqrt(44.0);