Remove unused STREQ macro

This fixes the following compilation warning:

    regex.c:516:0: warning: macro "STREQ" is not used [-Wunused-macros]
     #define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
     ^

* src/regex.c (STREQ): Remove unused macro.  It should have been removed
in a [4538a5e: Refactor regex character class parsing in [:name:]]
commit but was mistakenly left out.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/regex.c b/src/regex.c
index 8dafb118058..f7ca51184b3 100644
--- a/src/regex.c
+++ b/src/regex.c
@@ -513,8 +513,6 @@ init_syntax_once (void)
 
 #define BYTEWIDTH 8 /* In bits.  */
 
-#define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
-
 #ifndef emacs
 # undef max
 # undef min