Moved location of test for libcpp.complex

Added it to libcpp_all (where it should have been) instead
of a custom compile test.

complex isn't actually tested in libcpp_all, except that it
can be cimported

tests/compile/libcpp_cimport.pyx

-# tag: cpp
-# mode: compile
-
-# test that we can cimport the c++ standard library
-# (don't run it)
-cimport libcpp.algorithm
-cimport libcpp.cast
-cimport libcpp.complex 
-cimport libcpp.deque
-cimport libcpp.list
-cimport libcpp.map
-cimport libcpp.pair
-cimport libcpp.queue
-cimport libcpp.set
-cimport libcpp.stack
-cimport libcpp.string
-cimport libcpp.unordered_map
-cimport libcpp.unordered_set
-cimport libcpp.utility
-cimport libcpp.vector
-cimport libcpp
\ No newline at end of file

tests/run/libcpp_all.pyx

@@ -12,6 +12,7 @@ cimport libcpp.queue
 cimport libcpp.set
 cimport libcpp.stack
 cimport libcpp.vector
+cimport libcpp.complex
 
 from libcpp.deque  cimport *
 from libcpp.list   cimport *
@@ -21,6 +22,7 @@ from libcpp.queue  cimport *
 from libcpp.set    cimport *
 from libcpp.stack  cimport *
 from libcpp.vector cimport *
+from libcpp.complex cimport *
 
 cdef libcpp.deque.deque[int]   d1 = deque[int]()
 cdef libcpp.list.list[int]     l1 = list[int]()