Add BR for C compiler too

See https://fedoraproject.org/wiki/Packaging:C_and_C%2B%2B

amsynth.spec

@@ -1,6 +1,6 @@
 Name:           amsynth
 Version:        1.8.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A classic synthesizer with dual oscillators
 
 License:        GPLv2+
@@ -9,6 +9,9 @@ Source0:        https://github.com/nixxcode/%{name}/releases/download/release-%{
 Patch0:         amsynth.fixConstString.patch
 Patch1:         amsynth.fixMetainfo.patch
 
+# https://fedoraproject.org/wiki/Packaging:C_and_C%2B%2B
+BuildRequires:  gcc
+BuildRequires:  gcc-c++
 BuildRequires:  gtk2-devel
 BuildRequires:  jack-audio-connection-kit-devel lash-devel libsndfile-devel libsndfile-utils
 BuildRequires:  mesa-libGL-devel mesa-libEGL-devel
@@ -58,7 +61,7 @@ Obsoletes: dssi-amsynth-plugins
 Amsynth plugin for the dssi audio API
 
 %package -n vst-amsynth-plugin
-Summary: Amsynth lv2 plugin
+Summary: Amsynth vst plugin
 Requires: %{name}-data = %{version}-%{release}
 Obsoletes: vst-amsynth-plugins
 
@@ -72,12 +75,8 @@ Amsynth plugin for the vst protocl
 %patch1 -p1
 
 %build
-# Build in C++11 mode as glibmm headers use C++11 features. This can be dropped
-# when GCC in Fedora switches to C++11 by default (with GCC 6, most likely).
-export CXXFLAGS="%{optflags} -std=c++11"
-
 %configure --with-jack --with-alsa --with-jack --with-sndfile --with-lash --with-dssi --prefix=/usr
-make %{?_smp_mflags}
+%make_build
 
 
 %install
@@ -131,6 +130,10 @@ fi
 
 
 %changelog
+* Tue Aug 01 2017 Alexandre Moine <nobrakal@cthugha.org> - 1.8.0-2
+- Fix RHBGZ #1476525
+- Spec cleanup
+
 * Mon Jun 26 2017 Alexandre Moine <nobrakal@cthugha.org> - 1.8.0-1
 - New upstream release
 - Drop dependency on gtkmm