Two typo corrections

[Olly Betts]

I noticed the typo "occured" in a generated libtool script.  It turns
out this has already been corrected in libtool CVS HEAD, but similar
typos exists elsewhere in libtool: "occured" in the documentation should
be "occurred", and "occurence" in a code comment should be "occurrence".

Patch against CVS HEAD.

Cheers,
    Olly

Index: doc/libtool.texi
===================================================================
RCS file: /cvsroot/libtool/libtool/doc/libtool.texi,v
retrieving revision 1.134.2.11
diff -p -u -r1.134.2.11 libtool.texi
--- doc/libtool.texi    18 May 2005 07:49:39 -0000      1.134.2.11
+++ doc/libtool.texi    29 May 2005 00:39:29 -0000
@@ -3097,7 +3097,7 @@ The type of a matching unlock function.
 
 @deftypefn {Type} void lt_dlmutex_seterror @w{(const char address@hidden);}
 Many of the functions in the libltdl @sc{api} have a special return
-value to indicate to the client that an error has occured.  Normally (in
+value to indicate to the client that an error has occurred.  Normally (in
 single threaded applications) a string describing that error can be
 retrieved from internal storage with @code{lt_dlerror()}.
 
Index: libltdl/ltdl.c
===================================================================
RCS file: /cvsroot/libtool/libtool/libltdl/ltdl.c,v
retrieving revision 1.174.2.14
diff -p -u -r1.174.2.14 ltdl.c
--- libltdl/ltdl.c      22 Apr 2005 09:05:43 -0000      1.174.2.14
+++ libltdl/ltdl.c      29 May 2005 00:39:29 -0000
@@ -625,7 +625,7 @@ argz_create_sep (str, delim, pargz, parg
   assert (pargz);
   assert (pargz_len);
 
-  /* Make a copy of STR, but replacing each occurence of
+  /* Make a copy of STR, but replacing each occurrence of
      DELIM with '\0'.  */
   argz_len = 1+ LT_STRLEN (str);
   if (argz_len)