Switch from using 'nacl_main' to 'main' entry point

ports/grep/nacl.patch

Index: ports/grep/nacl.patch
diff --git a/ports/grep/nacl.patch b/ports/grep/nacl.patch
index b80ad70cfebed44d30223a32b3abeb77cd49d56b..77bcd63cea05c1acc1ad83aaf74b3a3ad4f91abe 100644
--- a/ports/grep/nacl.patch
+++ b/ports/grep/nacl.patch
@@ -154,15 +154,3 @@ diff --git a/src/Makefile.in b/src/Makefile.in
  install-binSCRIPTS: $(bin_SCRIPTS)
  	@$(NORMAL_INSTALL)
  	@list='$(bin_SCRIPTS)'; test -n "$(bindir)" || list=; \
-diff --git a/src/grep.c b/src/grep.c
---- a/src/grep.c
-+++ b/src/grep.c
-@@ -2107,7 +2107,7 @@ fgrep_to_grep_pattern (size_t len, char const *keys,
- }
- 
- int
--main (int argc, char **argv)
-+nacl_main (int argc, char **argv)
- {
-   char *keys;
-   size_t keycc, oldcc, keyalloc;