codegen: emit stdbool.h and complex.h when appropriate in C99 mode

Author: wence-

loopy/target/c/__init__.py

@@ -82,6 +82,11 @@ def dtype_to_ctype(self, dtype):
 def c99_preamble_generator(preamble_info):
     if any(dtype.is_integral() for dtype in preamble_info.seen_dtypes):
         yield("10_stdint", "#include <stdint.h>")
+    if any(dtype.numpy_dtype == np.dtype("bool")
+           for dtype in preamble_info.seen_dtypes):
+        yield("10_stdbool", "#include <stdbool.h>")
+    if any(dtype.is_complex() for dtype in preamble_info.seen_dtypes):
+        yield("10_complex", "#include <complex.h>")
 
 
 def _preamble_generator(preamble_info):