Enable DEP and ASLR

Enable DEP (Data Execution Prevention) and ASLR (Address Space Layout
Randomization) support. This applies to both 32bit and 64bit builds
and makes it substantially harder to exploit security holes in Git by
offering a much more unpredictable attack surface.

Signed-off-by: İsmail Dönmez <ismail@i10z.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

config.mak.uname

@@ -547,6 +547,10 @@ else
 	ifeq ($(shell expr "$(uname_R)" : '2\.'),2)
 		# MSys2
 		prefix = /usr/
+		# Enable DEP
+		BASIC_LDFLAGS += -Wl,--nxcompat
+		# Enable ASLR
+		BASIC_LDFLAGS += -Wl,--dynamicbase
 		ifeq (MINGW32,$(MSYSTEM))
 			prefix = /mingw32
 			BASIC_LDFLAGS += -Wl,--pic-executable,-e,_mainCRTStartup