[gcc] Fix mpc-devel package name. Contributes to JB#49681

Signed-off-by: Matti Kosola <matti.kosola@jolla.com>

gcc.spec

@@ -491,7 +491,7 @@ This is one set of libraries which support 64bit multilib on top of
 Summary: Support for compiling GCC plugins
 Group: Development/Languages
 Requires: gcc = %{version}-%{release}
-Requires: gmp-devel >= 4.1.2-8, mpfr-devel >= 2.2.1, libmpc-devel >= 0.8.1
+Requires: gmp-devel >= 4.1.2-8, mpfr-devel >= 2.2.1, mpc-devel >= 0.8.1
 
 %description plugin-devel
 This package contains header files and other support files