some fixes in order to silent GCC warnings about unused stuff

tests/compile/cnamespec.pyx

@@ -15,3 +15,6 @@ cdef double spam "c_spam" (int i, float f):
     b = p.i
     p.i = x
     p.i = y
+
+cdef inline double spam2 "c_spam2" (int i, float f):
+    return spam(i,f)

tests/compile/funcptr.pyx

@@ -4,3 +4,7 @@ cdef int grail():
     spam = grail
     spam()
 
+ctypedef int funcptr_t()
+
+cdef inline funcptr_t* dummy():
+    return &grail

tests/run/for_decrement.pyx

@@ -23,7 +23,7 @@ def range_loop_indices():
     Optimized integer for loops using range() should follow Python behavior, 
     and leave the index variable with the last value of the range.
     """
-    cdef int i, j, k, l, m
+    cdef int i, j, k=0, l, m
     for i in range(10): pass
     for j in range(2,10): pass
     for k in range(0,10,get_step()): pass
@@ -40,4 +40,4 @@ def from_loop_indices():
     for i from 0 <= i < 10 by get_step(): pass
     for j from 0 <= j < 10: pass
     for k from 10 > k > 0: pass
-    return i, j, k
\ No newline at end of file
+    return i, j, k