build: Add CMAKE_SYSTEM_NAME handling for NetBSD.

Author: alexrp

build

@@ -16,6 +16,7 @@ TARGET_OS_CMAKE=${TARGET_OS_AND_ABI%-*} # Example: linux
 case $TARGET_OS_CMAKE in
   macos*) TARGET_OS_CMAKE="Darwin";;
   freebsd*) TARGET_OS_CMAKE="FreeBSD";;
+  netbsd*) TARGET_OS_CMAKE="NetBSD";;
   windows*) TARGET_OS_CMAKE="Windows";;
   linux*) TARGET_OS_CMAKE="Linux";;
   native) TARGET_OS_CMAKE="";;

build.bat

@@ -25,6 +25,7 @@ set TARGET_OS_CMAKE=
 FOR /F "tokens=2,3 delims=-" %%i IN ("%TARGET%") DO (
   IF "%%i"=="macos" set "TARGET_OS_CMAKE=Darwin"
   IF "%%i"=="freebsd" set "TARGET_OS_CMAKE=FreeBSD"
+  IF "%%i"=="netbsd" set "TARGET_OS_CMAKE=NetBSD"
   IF "%%i"=="windows" set "TARGET_OS_CMAKE=Windows"
   IF "%%i"=="linux" set "TARGET_OS_CMAKE=Linux"
   set TARGET_ABI=%%j