- requires_eq, requires_eq_to now convert Requires to BuildRequires, making spec...

- requires_eq, requires_eq_to now convert Requires to BuildRequires, making spec syntax valid if packages are not present
- side effect is that requires_eq now accepts only one paramter, contrary to previous where it accepted long list.

The test results of the new macros:
$ rpm -q xulrunner zlib
package xulrunner is not installed
zlib-1.2.3-7.i686

$ rpm -E '%requires_eq'
ERROR
$ rpm -E '%requires_eq zlib'
Requires: zlib = 0:1.2.3
$ rpm -E '%requires_eq xulrunner'
BuildRequires: xulrunner
$ rpm -E '%requires_eq xulrunner zlib'
ERROR
$ rpm -E '%requires_eq_to'
ERROR
$ rpm -E '%requires_eq_to zlib'
ERROR
$ rpm -E '%requires_eq_to xulrunner zlib'
Requires: xulrunner = 0:1.2.3
$ rpm -E '%requires_eq_to xulrunner zlib zl'
ERROR
$ rpm -E '%requires_eq_to xulrunner xulrunner'
BuildRequires: xulrunner

Changed files:
    rpm.macros -> 1.503