[algs] Sprinkle hb_min/max with hb-forward salad

[algs] Sprinkle hb_min/max with hb-forward salad

Let's see if fixes MSVC fail.  Though, the error doesn't make sense to me.

  hb-blob.cc
c:\projects\harfbuzz\src\hb-algs.hh(166): error C2440: 'return': cannot convert from 'unsigned int' to 'unsigned int &&' [C:\projects\harfbuzz\build\harfbuzz.vcxproj]
  c:\projects\harfbuzz\src\hb-algs.hh(166): note: You cannot bind an lvalue to an rvalue reference
  c:\projects\harfbuzz\src\hb-algs.hh(174): note: see reference to function template instantiation 'T &&<unnamed-type-hb_min>::impl<T,unsigned int&>(T &&,T2) const' being compiled
          with
          [
              T=unsigned int,
              T2=unsigned int &
          ]