OpenBSD: support Boehm-GC, X11 and Sqlite (#10300)

vlib/builtin/builtin_d_gcboehm.v

@@ -8,19 +8,27 @@ $if static_boehm ? {
 		#flag   $first_existing("/opt/homebrew/lib/libgc.a", "/usr/local/lib/libgc.a")
 	} $else $if linux {
 		#flag -l:libgc.a
+	} $else $if openbsd {
+		#flag -I/usr/local/include
+		#flag /usr/local/lib/libgc.a
+		#flag -lpthread
 	} $else {
 		#flag -lgc
 	}
 } $else {
 	$if macos {
 		#pkgconfig bdw-gc
+	} $else $if openbsd || freebsd {
+		#flag -I/usr/local/include
+		#flag -L/usr/local/lib
 	}
 	$if windows {
 		#flag -I@VEXEROOT/thirdparty/libgc/include
 		#flag -L@VEXEROOT/thirdparty/libgc
-	}
+	} $else {
 		#flag -lgc
 	}
+}
 
 $if gcboehm_leak ? {
 	#define GC_DEBUG

vlib/builtin/builtin_nix.c.v

@@ -85,7 +85,7 @@ fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
 	$if no_backtrace ? {
 		return false
 	} $else {
-		$if !freestanding {
+		$if linux && !freestanding {
 			$if tinyc {
 				C.tcc_backtrace(c'Backtrace')
 				return false

vlib/clipboard/x11/clipboard.c.v

@@ -6,9 +6,15 @@ import time
 import sync
 import math
 
+$if freebsd {
+	#flag -I/usr/local/include
+	#flag -L/usr/local/lib
+} $else $if openbsd {
+	#flag -I/usr/X11R6/include
+	#flag -L/usr/X11R6/lib
+}
 #flag -lX11
-#flag freebsd -I/usr/local/include
-#flag freebsd -L/usr/local/lib -lX11
+
 #include <X11/Xlib.h> # Please install a package with the X11 development headers, for example: `apt-get install libx11-dev`
 // X11
 [typedef]

vlib/sqlite/sqlite.v

@@ -1,17 +1,19 @@
 module sqlite
 
-#flag darwin  -lsqlite3
-#flag linux   -lsqlite3
-#flag solaris -lsqlite3
-#flag freebsd -I/usr/local/include
-#flag freebsd -Wl -L/usr/local/lib -lsqlite3
+$if freebsd || openbsd {
+	#flag -I/usr/local/include
+	#flag -L/usr/local/lib
+}
+$if windows {
 	#flag windows -I@VEXEROOT/thirdparty/sqlite
 	#flag windows -L@VEXEROOT/thirdparty/sqlite
 	#flag windows @VEXEROOT/thirdparty/sqlite/sqlite3.o
-// #flag linux -I @VEXEROOT/thirdparty/sqlite
-// #flag @VEXEROOT/thirdparty/sqlite/sqlite.c
+} $else {
+	#flag -lsqlite3
+}
+
 #include "sqlite3.h"
-//
+
 struct C.sqlite3 {
 }