package/boinc: disable fcgi

libfcgi raises the following build failure with glibc 2.34 and gcc
11.2.0:

In file included from /home/peko/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/features.h:488,
                 from /home/peko/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/bits/libc-header-start.h:33,
                 from /home/peko/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/stdio.h:27,
                 from /home/peko/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/fcgi_stdio.h:18,
                 from boinc_fcgi.h:19,
                 from coproc.cpp:22:
/home/peko/autobuild/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot/usr/include/wchar.h:582:24: error: 'malloc' attribute argument 1 is ambiguous
  582 |   __attribute_malloc__ __attr_dealloc_fclose;
      |                        ^~~~~~~~~~~~~~~~~~~~~

RawTherapee has the same kind of issue:
 - https://github.com/Beep6581/RawTherapee/issues/6324
 - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101747

Fixes:
 - http://autobuild.buildroot.org/results/232dae62570ed7927a10864d83dccaf9b6214500

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 54cb3b506de44fb8389832a1612b55d179b2cfd4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/boinc/boinc.mk

@@ -26,6 +26,7 @@ BOINC_CONF_ENV = \
 BOINC_CONF_OPTS = \
 	--disable-apps \
 	--disable-boinczip \
+	--disable-fcgi \
 	--disable-manager \
 	--disable-server \
 	--enable-client \
@@ -38,13 +39,6 @@ ifeq ($(BR2_PACKAGE_FREETYPE),y)
 BOINC_DEPENDENCIES += freetype
 endif
 
-ifeq ($(BR2_PACKAGE_LIBFCGI),y)
-BOINC_DEPENDENCIES += libfcgi
-BOINC_CONF_OPTS += --enable-fcgi
-else
-BOINC_CONF_OPTS += --disable-fcgi
-endif
-
 BOINC_MAKE_OPTS = CXXFLAGS="$(TARGET_CXXFLAGS) -std=c++11"
 
 # Remove boinc-client because it is incompatible with buildroot