Work around incomplete closure input arguments on some platforms

[rosenrodt]

This fixes all the kernel compile errors I encountered when running test_closure, one example:

--- build log ---
BC-src-code:6:75: error: use of undeclared identifier 'pi'
 inline float add_two_and_pi(float x, int two, float  p){ return x + two + pi; }
                                                                           ^
1 diagnostic(s) generated.

I encountered this curious case when cross-compiling with the standalone toolchain generated from android NDK. Most tests pass. But closure is among one of the few that fails. It seems like boost::trim() from the main boost library somehow cuts off more character than it should and also leaves a leading whitespace.

two, pi          // original string   
[two,  pi]       // vector after split()

two              // after trim()
int two          // capture_traits<T>::type_name() << " " << variable_name

 p               // after trim(), there is a leading space before 'pi' and 'i' is cut off 
float  p         // capture_traits<T>::type_name() << " " << variable_name

[jszuppe]

That's odd that such an old function works incorrectly (boost::trim()). You should report that to https://github.com/boostorg/algorithm.

[coveralls]

Coverage decreased (-0.002%) to 84.017% when pulling 73d978b on rosenrodt:fix-closure-argument-cutoff into 36c8913 on boostorg:develop.

[rosenrodt]

Thank @jszuppe. I have opened a ticket here see how this goes boostorg/algorithm#58