rtcds: RCG Makefile should default to using environment for SITE
Determined site in the Makefile can differ from rtcds environment when running 'rtcds build'
See below, where environment is 'CARDIFF', but in the makefile it's 'zzz', which is some sort of default.
controls@cymac:/opt/rtcds/userapps/release$ rtcds install w1iop
Build kernel-mode models by default
RTS_VERSION=4.1.0
SITE=CARDIFF
IFO=W1
RCG_LIB_PATH=/opt/rtcds/userapps/release/sus/w1/models:/usr/share/advligorts/src/src/epics/simLink/:/usr/share/advligorts/src/src/epics/simLink/lib
RCG_SRC=/usr/share/advligorts/src
RCG_BUILD_ROOT=/var/cache/advligorts
RCG_BUILDD=/var/cache/advligorts/rcg-4.1.0
RCG_TARGET=/opt/rtcds/cardiff/w1
### installing w1iop...
Installing system=w1iop site=ZZZ ifo=W1
Installing channel file...
Installing EPICS sequencer...
Installing EPICS screens...
Installing RT components...
Installing GDS components...
Updating testpoint config file...
Option site_letter requires an argument
Usage: /usr/share/advligorts/src/src/epics/util/updateTestpointPar.pl -par_file=/opt/rtcds/geo/g1/target/gds/param/testpoint.par -gds_node=0 -site_letter=G -system=g1x11 -host=scipe17
cp: cannot stat '/opt/rtcds/zzz/w1/target/gds/param/archive/testpoint_210526_204249.par': No such file or directory
make: *** [Makefile:113: install-w1iop] Error 1