Enable Algol68 build in gcc trunk

Algol68 frontend has been merged in gcc trunk.

https://inbox.sourceware.org/gcc-patches/20251130010654.18879-3-jose.marchesi@oracle.com/

refs compiler-explorer/compiler-explorer#8310

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

Author: dkm

build/build.sh

@@ -151,8 +151,8 @@ elif echo "${VERSION}" | grep 'trunk'; then
     URL=git://gcc.gnu.org/git/gcc.git
     BRANCH=master
     MAJOR=16
-    MAJOR_MINOR=15-trunk
-    LANGUAGES="${LANGUAGES},go,d,rust,m2,cobol"
+    MAJOR_MINOR=16-trunk
+    LANGUAGES="${LANGUAGES},go,d,rust,m2,cobol,algol68"
     VERSION=trunk-$(date +%Y%m%d)
 elif echo "${VERSION}" | grep 'renovated'; then
     SUB_VERSION=$(echo "${VERSION}" | cut -d'-' -f2)
@@ -194,6 +194,9 @@ else
     # Languages introduced in 15
     if [[ "${MAJOR}" -ge 15 ]]; then LANGUAGES=${LANGUAGES},cobol; fi
 
+    # Languages introduced in 16
+    if [[ "${MAJOR}" -ge 16 ]]; then LANGUAGES=${LANGUAGES},algol68; fi
+
 fi
 
 ## If version is prefixed by "assertions-", do the extra steps we want for the