Improve linux build script
Improve linux build script

* Add missing shebang
* Remove unknown udev option "--disable-gudev"
* Make CFLAGS/LDFLAGS global
* Set special CFLAGS for arm architector for Raspberry Pi 1 compatibility

usb4java/libusb4java,anilgit90/libusb4java,usb4java/libusb4java,anilgit90/libusb4java