[Patch] add AC_EGREP_RAW macro to acgeneral.m4

[Neil Horman]

hey all-
     Pach to add AC_EGREP_RAW to acgeneral.m4.  While working on an
autoconf script I found that AC_EGREP_HEADER doesn't allow you to grep
for #define-ed values, since AC_EGREP_HEADER passes input through cpp.
 The macro allows a standard, no preprocessing EGREP on a file.

-- 
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 *Neil Horman
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autoconf.patch
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