doxygen: fix parallel build failure

- fix build race condition
- fixed SRCURL

with parallel build ( -j16 ) this happened:

```
In file included from /dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/src/vhdljjparser.h:23:0,
                 from /dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.h:8,
                 from /dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.cc:2:
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.cc: In member function ‘QCString vhdl::parser::VhdlParser::library_clause()’:
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/src/config.h:35:32: error: ‘ConfigValues’ has not been declared
 #define Config_getBool(val)   (ConfigValues::instance().val)
                                ^
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.cc:5720:22: note: in expansion of macro ‘Config_getBool’
 if ( parse_sec==0 && Config_getBool(SHOW_INCLUDE_FILES) )
                      ^~~~~~~~~~~~~~
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.cc: In member function ‘QCString vhdl::parser::VhdlParser::use_clause()’:
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/src/config.h:35:32: error: ‘ConfigValues’ has not been declared
 #define Config_getBool(val)   (ConfigValues::instance().val)
                                ^
/dev/shm/mxqd/mnt/job/19694203/doxygen-1.8.17-0/buildroot/doxygen/doxygen-1.8.17-0/source/vhdlparser/VhdlParser.cc:10420:43: note: in expansion of macro ‘Config_getBool’
                      if ( parse_sec==0 && Config_getBool(SHOW_INCLUDE_FILES) )
                                           ^~~~~~~~~~~~~~
make[2]: *** [vhdlparser/CMakeFiles/vhdlparser.dir/build.make:118: vhdlparser/CMakeFiles/vhdlparser.dir/VhdlParser.cc.o] Error 1

```

doxygen.be0

@@ -1,10 +1,11 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION doxygen-1.8.17-0
+# BEE_VERSION doxygen-1.8.17-1
 
 # more info: http://www.doxygen.nl/index.html
 
-SRCURL[0]="http://doxygen.nl/files/doxygen-${PKGVERSION}.src.tar.gz"
+#SRCURL[0]="http://doxygen.nl/files/doxygen-${PKGVERSION}.src.tar.gz"
+SRCURL[0]="https://beehive.molgen.mpg.de/7997a15c73a8bd6d003eaba5c2ee2b47/doxygen-1.8.17.src.tar.gz"
 
 # PATCHURL+=()
 
@@ -24,9 +25,9 @@ SRCURL[0]="http://doxygen.nl/files/doxygen-${PKGVERSION}.src.tar.gz"
 #    bee_configure
 #}
 
-#mee_build() {
-#    bee_build
-#}
+mee_build() {
+    bee_build -j1
+}
 
 #mee_install() {
 #    bee_install