Use python2 explicitly

Using unversioned python is forbidden in Fedora's RPMs.

guitarix.spec

@@ -16,7 +16,9 @@ Source0:        http://sourceforge.net/projects/%{name}/files/%{name}/%{altname2
 Patch3:         guitarix-0.35.0-abs-unsigned-fix.patch
 
 BuildRequires:  gcc-c++
-BuildRequires:  python
+BuildRequires:  python2
+BuildRequires:  %{_bindir}/find
+BuildRequires:  %{_bindir}/pathfix.py
 BuildRequires:  desktop-file-utils
 BuildRequires:  faust
 BuildRequires:  fftw-devel
@@ -139,6 +141,14 @@ guitarix, but can also be used by any other ladspa host.
 %prep
 %setup -q -n %{name}-%{version}
 
+# Fix unversioned python shebangs
+pathfix.py -pni %{_bindir}/python2 \
+    $(find -name wscript) \
+    waf \
+    tools/make_jsonrpc_methods \
+    src/gx_head/builder/make \
+    .
+
 # The build system does not use these bundled libraries by default. But
 # just to make sure:
 rm -fr src/zita-convolver src/zita-resampler