Pass C compiler to ant

__cc defaults to gcc, so this does not change the current build at all, but
it allows us to to do test builds with other compilers simply by
redefining the __cc macro.

jna.spec

@@ -3,7 +3,7 @@
 
 Name:           jna
 Version:        5.4.0
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Pure Java access to native libraries
 # Most of code is dual-licensed under either LGPL 2.1+ only or Apache
 # License 2.0.  WeakIdentityHashMap.java was taken from Apache CXF,
@@ -124,7 +124,7 @@ export JAVA_HOME=%{_jvmdir}/java
 # -Drelease removes the .SNAPSHOT suffix from maven artifact names
 #ant -Dcflags_extra.native="%{optflags}" -Ddynlink.native=true native compile javadoc jar contrib-jars
 ant -Drelease -Dcompatibility=1.6 -Dplatform.compatibility=1.6\
- -Dcflags_extra.native="%{optflags}" -Ddynlink.native=true native dist
+ -Dcflags_extra.native="%{optflags}" -Ddynlink.native=true -DCC=%{__cc} native dist
 # remove compiled contribs
 find contrib -name build -exec rm -rf {} \; || :
 
@@ -159,6 +159,9 @@ install -m 755 build/native*/libjnidispatch*.so %{buildroot}%{_libdir}/%{name}/
 
 
 %changelog
+* Thu Apr 02 2020 Tom Stellard <tstellar@redhat.com> - 5.4.0-3
+- Pass C compiler to ant
+
 * Wed Jan 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 5.4.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild