arches: lib: add main_decl.h for main() declaration

It is silly to have a single header to declare the main()
symbol, however some of the arches provided it while
lib/bootblock.c relied on the arch headers to declare it. Just
move the declaration into its own header file and utilize it.

Change-Id: I743b4c286956ae047c17fe46241b699feca73628
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13681
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/include/main_decl.h b/src/include/main_decl.h
new file mode 100644
index 0000000000..90c17161ed
--- /dev/null
+++ b/src/include/main_decl.h
@@ -0,0 +1,6 @@
+#ifndef _MAIN_DECL_H_
+#define _MAIN_DECL_H_
+
+void main(void);
+
+#endif