linux-user/arm: Reduce vdso alignment to 4k

Reduce vdso alignment to minimum page size.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit f7150b2151398c9274686d06c2c1e24618aa4cd6)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

linux-user/arm/Makefile.vdso

@@ -6,7 +6,7 @@ VPATH += $(SUBDIR)
 all: $(SUBDIR)/vdso-be.so $(SUBDIR)/vdso-le.so
 
 # Adding -use-blx disables unneeded interworking without actually using blx.
-LDFLAGS = -nostdlib -shared -Wl,-use-blx \
+LDFLAGS = -nostdlib -shared -Wl,-use-blx -Wl,-z,max-page-size=4096 \
 	  -Wl,-h,linux-vdso.so.1 -Wl,--build-id=sha1 \
 	  -Wl,--hash-style=both -Wl,-T,$(SUBDIR)/vdso.ld