Remove patch unneeded on any supported version of FreeBSD

That fixes build on head

graphics/picviz/files/patch-src-libpicviz-parser-lexer.l

@@ -1,51 +0,0 @@
---- src/libpicviz/parser/lexer.l.orig	2008-10-27 12:39:31.000000000 +0100
-+++ src/libpicviz/parser/lexer.l	2008-11-08 17:11:55.000000000 +0100
-@@ -19,7 +19,27 @@
- static char *realfile;
- 
- void yyerror (char *s);
-+
-+#ifdef __FreeBSD__
-+char* strndup(const char* string, size_t n)
-+{
-+        char* copy_string = 0;
-+
-+        if(0 == string || 0 == n)
-+                return 0;
-+
-+        copy_string = (char*) malloc(n + 1);
-+        if(0 == copy_string)
-+                return 0;
-+
-+        memcpy(copy_string, string, n);
-+        *(copy_string + n) = '\0';
-+
-+        return copy_string;
-+}
-+#else
- char * strndup (const char *s, size_t n);
-+#endif
- 
- #define MAX_INCLUDE_DEPTH 10
- YY_BUFFER_STATE includes[MAX_INCLUDE_DEPTH];
-@@ -48,7 +68,20 @@
-         return str;
- }
- 
-+void yyset_lineno(int line_number) {
-+	yylineno = line_number;
-+}
-+
-+int yyget_lineno() {
-+	return yylineno;
-+}
-+
-+char * yyget_text() {
-+	return yytext;
-+}
-+
- %}
-+%option yylineno
- %option noyywrap
- 
- SECTION		(header|engine|axes|data)