Eliminate warning from clang compilers.
Eliminate this warning from clang:
```
TPL/netcdf/netcdf-c/libdispatch/ncuri.c:914:31: warning: for loop has empty body [-Wempty-body]
for(p=sp,q=sp+1;(*p++=*q++););
^
TPL/netcdf/netcdf-c/libdispatch/ncuri.c:914:31: note: put the semicolon on a separate line to silence this warning
1 warning generated.
```
@@ -911,7 +911,8 @@ collectprefixparams(char* text, char** nextp)
for(;;) {
char* p; char* q;
/* by construction, here we are at an LBRACKET: compress it out */
- for(p=sp,q=sp+1;(*p++=*q++););
+ for(p=sp,q=sp+1;(*p++=*q++);)
+ ;
/* locate the next RRACKET */
ep = nclocate(sp,RBRACKETSTR);
if(ep == NULL) break;/* we are done */
