Fix errors when building an RPM

Building an RPM for OpenHPC of pnetcdf fails with:

```
+ /usr/lib/rpm/check-buildroot
/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0/bin/pnetcdf-config:prefix=/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0
/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0/bin/pnetcdf-config:exec_prefix=/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0
/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0/lib/pkgconfig/pnetcdf.pc:prefix=/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0
/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0/lib/pkgconfig/pnetcdf.pc:exec_prefix=/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64/opt/ohpc/pub/libs/gnu14/mvapich2/pnetcdf/1.14.0
Found '/home/ohpc/rpmbuild/BUILDROOT/pnetcdf-gnu14-mvapich2-ohpc-1.14.0-19999.ci.ohpc.x86_64' in installed files; aborting
```

The reason is that the variable DESTDIR is added to the path of the
binary location. This is, however, wrong. DESTDIR is the directory where
the files are installed but not where they are located in the final
RPM.

Keeping DESTDIR for the file location is correct but not for the path
where the files are located.

With this patch applied, it is possible to create an RPM without errors
like above.

Signed-off-by: Adrian Reber <areber@redhat.com>

Author: adrianreber

src/packaging/Makefile.am

@@ -12,6 +12,6 @@ pkgconfig_DATA = pnetcdf.pc
 # GNU autoconf allows DESTDIR variable when running 'make install' which will
 # prepend it before all installation names.
 install-data-hook:
-	$(SED_I) -e 's|INSTALL_PREFIX|$(DESTDIR)$(prefix)|g ; s|INSTALL_EXEC_PREFIX|$(DESTDIR)$(exec_prefix)|g' $(DESTDIR)$(libdir)/pkgconfig/pnetcdf.pc
+	$(SED_I) -e 's|INSTALL_PREFIX|$(prefix)|g ; s|INSTALL_EXEC_PREFIX|$(exec_prefix)|g' $(DESTDIR)$(libdir)/pkgconfig/pnetcdf.pc
 
 

src/utils/Makefile.am

@@ -36,6 +36,6 @@ dist-hook:
 # GNU autoconf allows DESTDIR variable when running 'make install' which will
 # prepend it before all installation names.
 install-exec-hook:
-	$(SED_I) -e 's|INSTALL_PREFIX|$(DESTDIR)$(prefix)|g ; s|INSTALL_EXEC_PREFIX|$(DESTDIR)$(exec_prefix)|g' $(DESTDIR)$(bindir)/pnetcdf-config
+	$(SED_I) -e 's|INSTALL_PREFIX|$(prefix)|g ; s|INSTALL_EXEC_PREFIX|$(exec_prefix)|g' $(DESTDIR)$(bindir)/pnetcdf-config
 	chmod +x $(DESTDIR)$(bindir)/pnetcdf-config