tre.bi: Fix dupdefs under TRE_USE_SYSTEM_REGEX_H

These functions are already declared in crt/regex.bi which is used under
TRE_USE_SYSTEM_REGEX_H.

changelog.txt

@@ -13,6 +13,7 @@ Version 1.06.0
 - utf_conv.bi: When given a NULL destination buffer, no-op conversions (UTF16 => UTF16 or UTF32 => UTF32) didn't allocate a new buffer, but just returned the source buffer, violating the contract used for proper conversions (which allocate a new buffer if a NULL destination is passed).
 - utf_conv.bi: In UTF8 => UTF16/32 and UTF32 => UTF16 conversions, strings longer than 8 chars could be truncated
 - #797: False-positive warnings when mixing booleans with comparisons in logic operations
+- TRE binding: Didn't compile with TRE_USE_SYSTEM_REGEX_H
 
 
 Version 1.05.0

inc/tre/tre.bi

@@ -114,13 +114,9 @@ const REG_NOSPEC = REG_LITERAL
 const RE_DUP_MAX = 255
 
 #ifdef TRE_USE_SYSTEM_REGEX_H
-	declare function regcomp(byval preg as regex_t ptr, byval regex as const zstring ptr, byval cflags as long) as long
 	declare function tre_regcomp alias "regcomp"(byval preg as regex_t ptr, byval regex as const zstring ptr, byval cflags as long) as long
-	declare function regexec(byval preg as const regex_t ptr, byval string as const zstring ptr, byval nmatch as uinteger, byval pmatch as regmatch_t ptr, byval eflags as long) as long
 	declare function tre_regexec alias "regexec"(byval preg as const regex_t ptr, byval string as const zstring ptr, byval nmatch as uinteger, byval pmatch as regmatch_t ptr, byval eflags as long) as long
-	declare function regerror(byval errcode as long, byval preg as const regex_t ptr, byval errbuf as zstring ptr, byval errbuf_size as uinteger) as uinteger
 	declare function tre_regerror alias "regerror"(byval errcode as long, byval preg as const regex_t ptr, byval errbuf as zstring ptr, byval errbuf_size as uinteger) as uinteger
-	declare sub regfree(byval preg as regex_t ptr)
 	declare sub tre_regfree alias "regfree"(byval preg as regex_t ptr)
 #else
 	declare function tre_regcomp(byval preg as regex_t ptr, byval regex as const zstring ptr, byval cflags as long) as long