Check for endian.h before including it. Fixes compilation on FreeBSD.

meson.build

@@ -12,6 +12,9 @@ atomicdep = cxx.find_library('atomic', required: false)
 if not uringdep.found()
 	add_project_arguments('-DWITHOUT_URING', language: 'cpp')
 endif
+if cxx.has_header('endian.h')
+	add_project_arguments('-DHAS_ENDIAN_H', language: 'cpp')
+endif
 
 # Function multiversioning is x86-only _and_ not available on certain targets
 # (they need “ifunc”, indirect functions, a GNU extension).

turbopfor-encode.h

@@ -15,7 +15,9 @@
 
 #include <algorithm>
 #include <assert.h>
+#ifdef HAS_ENDIAN_H
 #include <endian.h>
+#endif
 #include <limits.h>
 #include <stdint.h>
 #include <string.h>

turbopfor.cpp

@@ -1,6 +1,8 @@
 #include <algorithm>
 #include <assert.h>
+#ifdef HAS_ENDIAN_H
 #include <endian.h>
+#endif
 #include <stdint.h>
 #include <string.h>
 #include <strings.h>