CMakeModule: Modify find gdal order

[KangLin]

No description provided.

[jasonbeverage]

Thanks for the PR, can you explain why this is needed? The FindGDAL.cmake hasn't changed in 5 years and as far as I know we've had no issues related to it.

[KangLin]

I use vs2015 in msys2 bash environment, but it finds gdal.lib. Then, it can not find gdal.lib dependent libraries (for example: odbc, etc.). However, gdal_i.lib containing these dependent information. So the gdal_i to the front, so FindGDAL.cmake to find it.

Error information:
10778‍‍
10779‍‍"C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\install.vcxproj" (default target) (1) ->
10780‍‍"C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\ALL_BUILD.vcxproj" (default target) (3) ->
10781‍‍"C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\applications\osgearth_3pv\application_osgearth_3pv.vcxproj" (default target) (4) ->
10782‍‍"C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj" (default target) (5) ->
10783‍‍(Link target) ->
10784‍‍ gdal.lib(ogrmssqlspatialdatasource.obj) : error LNK2019: unresolved external symbol _SQLAllocEnv@4 referenced in function "public: int __thiscall OGRMSSQLSpatialDataSource::Open(char const *,int,int)" (?Open@OGRMSSQLSpatialDataSource@@QAEHPBDHH@Z) [C:\pr‍ojects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj]
10785‍‍ gdal.lib(ogrdb2cli.obj) : error LNK2001: unresolved external symbol _SQLAllocEnv@4 [C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj]
10786‍‍ gdal.lib(cpl_odbc.obj) : error LNK2001: unresolved external symbol _SQLAllocEnv@4 [C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj]
10787‍‍ gdal.lib(ogrmssqlspatialdatasource.obj) : error LNK2019: unresolved external symbol _SQLFreeEnv@4 referenced in function "public: int __thiscall OGRMSSQLSpatialDataSource::Open(char const *,int,int)" (?Open@OGRMSSQLSpatialDataSource@@QAEHPBDHH@Z) [C:\pro‍jects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj]
10788‍‍ gdal.lib(ogrdb2cli.obj) : error LNK2001: unresolved external symbol _SQLFreeEnv@4 [C:\projects\rabbitim-third-library\src\osgearth\build_windows_msvc\src\osgEarth\osgEarth.vcxproj]