Trim down libcompat by removing <regexp.h>.

Erwin ran an exp-run with libcompat and <regexp.h> removed. It turns out
the regexp library is almost entirely unused. In fact, it looks like it
is sometimes used by accident. Because these function names clash with
libc's <regex.h>, some application use both <regex.h> and libcompat,
which means they link against the wrong regex library.

This commit removes the regexp library and reimplements re_comp() and
re_exec() using <regex.h>. It seems the grammar of the regular
expressions accepted by these functions is similar to POSIX EREs.

After this commit, 1 low-profile port will be broken, but the maintainer
already has a patch for it sitting in his mailbox.

1 files changed, 0 insertions, 5 deletions

diff --git a/lib/libcompat/regexp/regmagic.h b/lib/libcompat/regexp/regmagic.h
deleted file mode 100644
index 5acf447..0000000
--- a/lib/libcompat/regexp/regmagic.h
+++ /dev/null
@@ -1,5 +0,0 @@
-/*
- * The first byte of the regexp internal "program" is actually this magic
- * number; the start node begins in the second byte.
- */
-#define	MAGIC	0234