mk_check_libraries — Check for libraries
MODULES="... compiler ..."
mk_check_libraries libs...
For each library in libs, mk_check_library
is invoked to check for its availability. HAVE_LIB_
is set to the result. If the library was available, LIBHAVE_LIB_
is defined in the current config header and LIBLIB_ is
set to LIBlib (this is useful for conditionally linking to the library
with LIBDEPS= later on). A message is printed indicating the result of each test.