Centos7 - cant get past make

Possibly related to #589

Afraid I'm seeing exact same issue on Centos 7

`depbase=`echo outputs/raop_verification.o | sed 's|[^/]*$|.deps/&|;s|\.o$||'`;\
gcc -DHAVE_CONFIG_H -I. -I..  -Wall -I/usr/include/ffmpeg   -I/usr/include/json-c -D_THREAD_SAFE -D_REENTRANT -D_REENTRANT   -pthread -I/usr/include/libxml2 -I/usr/include/alsa  -D_GNU_SOURCE -DDATADIR=\"/usr/share/forked-daapd\" -DCONFDIR=\"/etc\" -DSTATEDIR=\"/var\" -DPKGLIBDIR=\"/usr/lib/forked-daapd\"   -g -O2 -MT outputs/raop_verification.o -MD -MP -MF $depbase.Tpo -c -o outputs/raop_verification.o outputs/raop_verification.c &&\
mv -f $depbase.Tpo $depbase.Po
outputs/raop_verification.c: In function ‘encrypt_gcm’:
outputs/raop_verification.c:795:51: error: ‘GCRY_CIPHER_MODE_GCM’ undeclared (first use in this function)
   err = gcry_cipher_open(&hd, GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_GCM, 0);
                                                   ^
outputs/raop_verification.c:795:51: note: each undeclared identifier is reported only once for each function it appears in
outputs/raop_verification.c:823:3: warning: implicit declaration of function ‘gcry_cipher_gettag’ [-Wimplicit-function-declaration]
   err = gcry_cipher_gettag(hd, tag, AUTHTAG_LENGTH);
   ^
make[3]: *** [outputs/raop_verification.o] Error 1
make[3]: Leaving directory `/home/admin/forked-daapd/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/admin/forked-daapd/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/admin/forked-daapd'
make: *** [all] Error 2
`

[admin@dockerhost forked-daapd]$ sudo yum install libgcrypt*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: ftp.heanet.ie
 * elrepo: mirrors.coreix.net
 * epel: mirrors.coreix.net
 * extras: ftp.heanet.ie
 * nux-dextop: mirror.li.nux.ro
 * updates: ftp.heanet.ie
Package libgcrypt-1.5.3-14.el7.x86_64 already installed and latest version
Package libgcrypt-devel-1.5.3-14.el7.x86_64 already installed and latest version
Nothing to do

I think this indicates the issue https://stackoverflow.com/questions/48082836/macro-not-found-in-libgcrypt-on-centos-7

owntone / owntone-server

Centos7 - cant get past make #609