generalise handling of szip(.dll)?.a in other builds

It was set up to work when szip is unpacked from a previous build,
in whuch case the libsz.a file existed.  But this renaming is done
in the packing step so new builds have libsz.dll.a.

The need to specify the libsz path might ultimately be due to
the pkg-config version but this approach works for now.

build.sh

@@ -1276,6 +1276,10 @@ echo "SET_TARGET_PROPERTIES (\${HDF5_HL_LIBSH_TARGET}       PROPERTIES SUFFIX $D
 echo "SET_TARGET_PROPERTIES (\${HDF5_HL_CPP_LIBSH_TARGET}   PROPERTIES SUFFIX $DLLSUFFIX.dll)">> CMakeLists.txt
 echo "SET_TARGET_PROPERTIES (\${HDF5_TOOLS_LIBSH_TARGET}    PROPERTIES SUFFIX $DLLSUFFIX.dll)">> CMakeLists.txt
 echo "ENDIF ()" >> CMakeLists.txt
+
+szlib=$OUTLIB/libsz.dll.a
+[ -e $OUTLIB/libsz.a ] && szlib=$OUTLIB/libsz.a
+
 mkdir MY_BUILD
 cd MY_BUILD
 xxrun cmake -G 'MSYS Makefiles' -Wno-dev -DCMAKE_INSTALL_PREFIX=$OUT \
@@ -1292,7 +1296,7 @@ xxrun cmake -G 'MSYS Makefiles' -Wno-dev -DCMAKE_INSTALL_PREFIX=$OUT \
             -DHDF5_ENABLE_SZIP_SUPPORT=ON \
             -DHDF5_ENABLE_SZIP_ENCODING=ON \
             -DSZIP_INCLUDE_DIR=$OUT/include \
-            -DSZIP_LIBRARY=$OUT/lib/libsz.a \
+            -DSZIP_LIBRARY=$szlib \
             ..
 
             ###-DHDF5_INSTALL_CMAKE_DIR="lib/cmake" \
@@ -1334,6 +1338,10 @@ echo "SET_TARGET_PROPERTIES (\${HDF4_MF_LIBSH_TARGET}              PROPERTIES SU
 #echo "SET_TARGET_PROPERTIES (\${HDF4_SRC_FCSTUB_LIB_NAME} PROPERTIES SUFFIX $DLLSUFFIX.dll)">> CMakeLists.txt
 #echo "SET_TARGET_PROPERTIES (\${HDF4_SRC_FORTRAN_LIB_NAME} PROPERTIES SUFFIX $DLLSUFFIX.dll)">> CMakeLists.txt
 echo "ENDIF ()" >> CMakeLists.txt
+
+szlib=$OUTLIB/libsz.dll.a
+[ -e $OUTLIB/libsz.a ] && szlib=$OUTLIB/libsz.a
+
 mkdir MY_BUILD
 cd MY_BUILD
 cp ../COPYING.txt ./
@@ -1350,7 +1358,7 @@ xxrun cmake -G 'Unix Makefiles' -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=$O
                                                        -DHDF4_NO_PACKAGES=ON \
                                                        -DHDF4_ENABLE_NETCDF=OFF \
                                                        -DSZIP_INCLUDE_DIR=$OUT/include \
-                                                       -DSZIP_LIBRARY=$OUT/lib/libsz.a \
+                                                       -DSZIP_LIBRARY=$szlib \
                                                        ..
 xxrun gmake
 xxrun gmake install