Merge branch '1880-proj-linking-to-gdal-in-superbuild' into 'develop'

Resolve "PROJ linking to GDAL in Superbuild"

Closes #1880

See merge request !561

SuperBuild/CMake/External_gdal.cmake

@@ -105,6 +105,7 @@ if(UNIX)
     --with-webp=no
     --with-threads=yes
     --with-freexl=no
+    --with-proj=yes
     --with-libjson-c=internal
     ${GDAL_SB_CONFIG}
     ${GDAL_SB_EXTRA_OPTIONS}

SuperBuild/patches/GDAL/nmake_gdal_extra.opt.in

@@ -44,6 +44,7 @@ SQLITE_LIB=@SB_INSTALL_PREFIX_NATIVE@\lib\sqlite3.lib
 SQLITE_HAS_COLUMN_METADATA=yes
 
 # PROJ.4 stuff
+PROJ_FLAGS = -DPROJ_STATIC -DPROJ_VERSION=4
 PROJ_INCLUDE = -I@SB_INSTALL_PREFIX_NATIVE@\include
 PROJ_LIBRARY = @SB_INSTALL_PREFIX_NATIVE@\lib\proj.lib