Recommended compiler and linker flags for GCC when building native library

[myfirenze]

libpty.so is embedded in the pty4j java library. Some security compiler and linker flags are not enabled for the Linux platform when building libpty.so, which may cause security risks

FilePath	Object	BIND_NOW	NX	PIC	PIE	RELRO	SP	NO Rpath/RunPath	FS	Ftrapv	Strip
pty4j-0.9.4.jar_/resources/com/pty4j/native/linux/x86/libpty.so	libpty.so	NO	YES	YES	UNUSED	NO	NO	NO	NO	NO	NO
pty4j-0.9.4.jar_/resources/com/pty4j/native/freebsd/x86/libpty.so	libpty.so	NO	YES	YES	UNUSED	NO	NO	NO	NO	NO	NO
pty4j-0.9.4.jar_/resources/com/pty4j/native/linux/ppc64le/libpty.so	libpty.so	NO	YES	YES	UNUSED	YES	YES	NO	NO	NO	NO
pty4j-0.9.4.jar_/resources/com/pty4j/native/freebsd/x86_64/libpty.so	libpty.so	NO	YES	YES	UNUSED	NO	NO	NO	NO	NO	NO
pty4j-0.9.4.jar_/resources/com/pty4j/native/linux/x86_64/libpty.so	libpty.so	NO	YES	YES	UNUSED	NO	NO	NO	NO	NO	NO

See https://developers.redhat.com/blog/2018/03/21/compiler-and-linker-flags-gcc/