Fix typo in RPM spec file: s/RM_OPT_FLAGS/RPM_OPT_FLAGS/

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Merge pull request #1 from cvubrugier/master

Fix typo in RPM spec file: s/RM_OPT_FLAGS/RPM_OPT_FLAGS/