Add missing BuildRequires on gcc

/bin/sh: gcc: command not found

References: https://bugzilla.redhat.com/show_bug.cgi?id=1605410
Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

perl-Inline-Python.spec

@@ -7,6 +7,7 @@ Group:          Development/Libraries
 URL:            https://metacpan.org/release/Inline-Python
 Source0:        https://cpan.metacpan.org/authors/id/N/NI/NINE/Inline-Python-%{version}.tar.gz
 Patch0:         Inline-Python-0.56-Use-python3.patch
+BuildRequires:  gcc
 BuildRequires:  findutils
 BuildRequires:  make
 BuildRequires:  perl-devel