Ajout version Release/x64 avec les libraries x64 et tuning de la version Debug

SQCSim2021/external/glew210/config/Makefile.linux-mingw64

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+# For cross-compiling from Linux to Windows amd64 using mingw32
+# http://www.mingw.org/
+#
+# $ make SYSTEM=linux-mingw64
+
+NAME  := glew32
+HOST  := i686-w64-mingw32
+CC    := $(HOST)-gcc
+LD    := $(HOST)-ld
+LN    :=
+STRIP :=
+LDFLAGS.GL = -lopengl32 -lgdi32 -luser32 -lkernel32
+CFLAGS.EXTRA  += -fno-builtin -fno-stack-protector
+#LDFLAGS.EXTRA += -nostdlib
+WARN = -Wall -W
+POPT = -O2
+BIN.SUFFIX = .exe
+LIB.SONAME    = lib$(NAME).dll
+LIB.DEVLNK    = lib$(NAME).dll.a    # for mingw this is the dll import lib
+LIB.SHARED    = $(NAME).dll
+LIB.STATIC    = lib$(NAME).a        # the static lib will be broken
+LDFLAGS.SO    = -shared -soname $(LIB.SONAME) --out-implib lib/$(LIB.DEVLNK)