[Cin] More fun with new (2020) openCV and old gcc (5.5.0)

[Andrew Randrianasulu]

Apparently, this new openCV, as opposed to one from 2018, ALSO
started to demand stc++11 :}

diff --git a/cinelerra-5.1/opencv_build b/cinelerra-5.1/opencv_build
index fd029027..fabb8775 100644
--- a/cinelerra-5.1/opencv_build
+++ b/cinelerra-5.1/opencv_build
@@ -49,6 +49,7 @@ jobs:=-j$(shell echo $$(($(cpus) + $(cpus)/2 +2)))
 #opencv4 breaks SIFT/SURF findobj
 CFLAGS += -I$(opencv_prefix)/include/opencv4
 CFLAGS += -I$(opencv_prefix)/include
+CFLAGS += -std=c++11
 
 ifeq ($(src),git)
 $(opencv).src:

just this fixes build on 32-bit gcc 5.5.0 (Slackware 14.2) for me.

But I looked into opencv build ..and tried to disable more components, see second patch

diff --git a/cinelerra-5.1/opencv_build b/cinelerra-5.1/opencv_build
index fd029027..20908747 100644
--- a/cinelerra-5.1/opencv_build
+++ b/cinelerra-5.1/opencv_build
@@ -49,6 +49,7 @@ jobs:=-j$(shell echo $$(($(cpus) + $(cpus)/2 +2)))
 #opencv4 breaks SIFT/SURF findobj
 CFLAGS += -I$(opencv_prefix)/include/opencv4
 CFLAGS += -I$(opencv_prefix)/include
+CFLAGS += -std=c++11
 
 ifeq ($(src),git)
 $(opencv).src:
@@ -81,6 +82,9 @@ $(opencv)/build: $(opencv).src
   -DINSTALL_C_EXAMPLES=OFF \
   -DINSTALL_PYTHON_EXAMPLES=OFF \
   -DBUILD_EXAMPLES=OFF .. \
+  -DBUILD_PERF_TESTS=OFF \
+  -DBUILD_TESTS=OFF \
+  -DBUILD_opencv_apps=OFF \
   -DBUILD_opencv_python3=no \
   -DCMAKE_INSTALL_PREFIX=/usr/local \
   -DOPENCV_EXTRA_MODULES_PATH="$(opencv)_contrib/modules/"

on the basis Cin's plugins will try to link to OpenCVs *.a  libraries anyway, so 
better to get to this phase earlier, and with less hdd used.
BUT second patch not tested yet.
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