[PATCH v2] travis-ci: Disable C++ on Aarch64 container

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Travis-CI seems to have enforced memory limit on containers,
and the 'GCC check-tcg' job started to fail [*]:

  [2041/3679] Compiling C++ object libcommon.fa.p/disas_nanomips.cpp.o
  FAILED: libcommon.fa.p/disas_nanomips.cpp.o
  {standard input}: Assembler messages:
  {standard input}:577781: Warning: end of file not at end of a line; newline inserted
  {standard input}:577882: Error: unknown pseudo-op: `.lvl35769'
  {standard input}: Error: open CFI at the end of file; missing .cfi_endproc directive
  c++: fatal error: Killed signal terminated program cc1plus
  compilation terminated.

Until we have a replacement for this job on Gitlab-CI, disable
compilation of C++ files by forcing the c++ compiler to /bin/false
so Meson build system can not detect it:

  $ ../configure --cxx=/bin/false

  Compilation
                       C compiler: cc
                  Host C compiler: cc
                     C++ compiler: NO

[*] https://travis-ci.org/github/qemu/qemu/jobs/757819402#L3754

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
v2: Link to first line with error, describe Meson
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 5f1dea873ec..b4b2d66fa4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -261,7 +261,7 @@ jobs:
           - genisoimage
       env:
         - TEST_CMD="make check check-tcg V=1"
-        - CONFIG="--disable-containers --target-list=${MAIN_SOFTMMU_TARGETS}"
+        - CONFIG="--disable-containers --target-list=${MAIN_SOFTMMU_TARGETS} --cxx=/bin/false"
         - UNRELIABLE=true
 
     - name: "[ppc64] GCC check-tcg"
-- 
2.26.2