Moved dlopen version of osdFindSymbol.c into posix

It was identical in solaris, Darwin and Linux, and had
not been included for cygwin so this reduces duplication.

src/libCom/osi/os/Linux/osdFindSymbol.c

@@ -1,27 +0,0 @@
-/*************************************************************************\
-* Copyright (c) 2009 UChicago Argonne LLC, as Operator of Argonne
-*     National Laboratory.
-* EPICS BASE is distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-/* osi/os/default/epicsFindSymbol.c */
-
-#include <dlfcn.h>
-
-#define epicsExportSharedSymbols
-#include "epicsFindSymbol.h"
-
-epicsShareFunc void * epicsLoadLibrary(const char *name)
-{
-    return dlopen(name, RTLD_LAZY | RTLD_GLOBAL);
-}
-
-epicsShareFunc const char *epicsLoadError(void)
-{
-    return dlerror();
-}
-
-epicsShareFunc void * epicsShareAPI epicsFindSymbol(const char *name)
-{
-    return dlsym(0, name);
-}

src/libCom/osi/os/posix/osdFindSymbol.c

@@ -4,7 +4,7 @@
 * EPICS BASE is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution. 
 \*************************************************************************/
-/* osi/os/default/epicsFindSymbol.c */
+/* osi/os/posix/epicsFindSymbol.c */
 
 #include <dlfcn.h>
 

src/libCom/osi/os/solaris/osdFindSymbol.c

@@ -1,27 +0,0 @@
-/*************************************************************************\
-* Copyright (c) 2009 UChicago Argonne LLC, as Operator of Argonne
-*     National Laboratory.
-* EPICS BASE is distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-/* osi/os/default/epicsFindSymbol.c */
-
-#include <dlfcn.h>
-
-#define epicsExportSharedSymbols
-#include "epicsFindSymbol.h"
-
-epicsShareFunc void * epicsLoadLibrary(const char *name)
-{
-    return dlopen(name, RTLD_LAZY | RTLD_GLOBAL);
-}
-
-epicsShareFunc const char *epicsLoadError(void)
-{
-    return dlerror();
-}
-
-epicsShareFunc void * epicsShareAPI epicsFindSymbol(const char *name)
-{
-    return dlsym(0, name);
-}