Compiling EPICS 3.15.4 with GCC 6.3.0

[Jeong Han Lee <citadel.lee@gmail.com>]

Hi All,

   The following compiling error welcomed me when I compiled EPICS 
3.15.4 on Debian 9.

```
  /usr/bin/g++  -D_GNU_SOURCE -D_DEFAULT_SOURCE            -D_X86_64_ 
-DUNIX  -Dlinux     -O3 -g   -Wall      -mtune=generic     -m64  -I. 
-I../O.Common -I. -I. -I.. 
-I/epics/bases/base-3.15.4/include/compiler/gcc 
-I/epics/bases/base-3.15.4/include/os/Linux 
-I/epics/bases/base-3.15.4/include         -c ../epicsExceptionTest.cpp
../epicsExceptionTest.cpp: In function ‘void epicsExceptionTestPrivate()’:
../epicsExceptionTest.cpp:61:49: error: size of array is too large
         char * p = new char [unsuccessfulNewSize];
                                                 ^
../epicsExceptionTest.cpp:74:38: error: size of array is too large
             char [unsuccessfulNewSize];
                                      ^
../../../../configure/RULES_BUILD:234: recipe for target 
'epicsExceptionTest.o' failed
make[4]: *** [epicsExceptionTest.o] Error 1
make[4]: Leaving directory 
'/home/jhlee/e3/e3-base/epics-base/src/libCom/test/O.linux-x86_64'
../../../configure/RULES_ARCHS:61: recipe for target 
'install.linux-x86_64' failed
make[3]: *** [install.linux-x86_64] Error 2
make[3]: Leaving directory 
'/home/jhlee/e3/e3-base/epics-base/src/libCom/test'
../configure/RULES_DIRS:88: recipe for target 'libCom/test.install' failed
make[2]: *** [libCom/test.install] Error 2
make[2]: Leaving directory '/home/jhlee/e3/e3-base/epics-base/src'
configure/RULES_DIRS:88: recipe for target 'src.install' failed
```

  I saw the same compile error in old tech-talk [1], and one of the 
following solution allowed me to compile the EPICS base properly.

1) edit static size_t unsuccessfulNewSize = numeric_limits < size_t > :: 
max (); in epicsExceptionTest.cpp

2) USR_CXXFLAGS = -std=gnu++98 in configure/CONFIG_COMMON


  gcc info is

```
gcc --version
gcc (Debian 6.3.0-18) 6.3.0 20170516


gcc -dM -E - </dev/null |grep STDC
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_IEC_559__ 1
#define __STDC_ISO_10646__ 201605L
#define __STDC_NO_THREADS__ 1
#define _STDC_PREDEF_H 1
#define __STDC_IEC_559_COMPLEX__ 1
#define __STDC_VERSION__ 201112L
#define __GNUC_STDC_INLINE__ 1
#define __STDC_UTF_32__ 1
#define __STDC__ 1
```


  Best,
  Han


[1] http://www.aps.anl.gov/epics/tech-talk/2016/msg01113.php