!35 add -j option for building efficiency optimization

From: @tong_1001
Reviewed-by: @overweight
Signed-off-by: @overweight

crash.spec

@@ -1,6 +1,6 @@
 Name: crash
 Version: 7.2.9
-Release: 2
+Release: 3
 Summary: Linux kernel crash utility.
 License: GPLv3
 URL: https://crash-utility.github.io
@@ -45,7 +45,7 @@ created by manufacturer-specific firmware.
 
 %build
 cp %{SOURCE1} .
-make RPMPKG="%{version}-%{release}" CFLAGS="%{optflags}" LDFLAGS="%{build_ldflags}"
+make -j RPMPKG="%{version}-%{release}" CFLAGS="%{optflags}" LDFLAGS="%{build_ldflags}"
 
 %install
 rm -rf %{buildroot}
@@ -76,6 +76,9 @@ install -D -m 0644 defs.h %{buildroot}%{_includedir}/%{name}/defs.h
 %{_mandir}/man8/crash.8*
 
 %changelog
+* Mon May 10 2021 shixuantong <shixuantong@huawei.com> - 7.2.9-3
+- add -j option for building efficiency optimization
+
 * Thu Apr 08 2021 shixuantong <shixuantong@huawei.com> - 7.2.9-2
 - fix patch issue in upgrade version commit