rpm: use defined prefix from meson

meson use default prefix with /usr/local
so rpm default macro defined installation directoy occur error

RPM build errors:
    File not found: /root/rpmbuild/BUILDROOT/libnvme-1.11-0.x86_64/usr/lib64/libnvme*

To fix this use defined prefix from meson

Signed-off-by: Steven Seungcheol Lee <[email protected]>

Author: sc108-lee

libnvme.spec.in

@@ -21,6 +21,8 @@ Provides: libnvme.so.1
 This package provides header files to include and libraries to link with
 for Linux-native nvme device maangement.
 
+%define _prefix @PREFIX@
+
 %prep
 %autosetup -c
 

meson.build

@@ -264,6 +264,7 @@ substs = configuration_data()
 substs.set('NAME',    meson.project_name())
 substs.set('VERSION', meson.project_version())
 substs.set('LICENSE', meson.project_license()[0])
+substs.set('PREFIX', prefixdir)
 configure_file(
     input:         'libnvme.spec.in',
     output:        'libnvme.spec',