Fix make to follow fedora's build

This way proper CFLAGS/LDFLAGS are passed and annocheck is ok.

Related: rhbz#2012774

libbpf.spec

@@ -9,7 +9,7 @@
 
 Name:           libbpf
 Version:        0.5.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Libbpf library
 
 License:        LGPLv2 or BSD
@@ -48,7 +48,7 @@ developing applications that use %{name}
 %define _lto_cflags %{nil}
 
 %global libbpf_make \
-  make EXTRA_CFLAGS="${RPM_OPT_FLAGS}" EXTRA_LDFLAGS="%{__global_ldflags}" DESTDIR=%{buildroot} V=1
+  make DESTDIR=%{buildroot} OBJDIR=%{_builddir} CFLAGS="%{build_cflags} -fPIC" LDFLAGS="%{build_ldflags} -Wl,--no-as-needed" LIBDIR=/%{_libdir} NO_PKG_CONFIG=1
 
 %prep
 %setup -n %{source}
@@ -76,6 +76,10 @@ popd
 %{_libdir}/libbpf.a
 
 %changelog
+* Fri Oct 11 2021 Jiri Olsa <jolsa@redhat.com> - 2:0.5.0-2
+- Fix passing of system's CFLAGS/LDFLAGS
+- Related: rhbz#2012774
+
 * Fri Oct 1 2021 Jiri Olsa <jolsa@redhat.com> - 2:0.5.0-1
 - update to RHEL spec
 - Related: rhbz#2009725