installer: fix version of installer and installed file

As reported by @JJClements, the File version and Product version of the
installer and installer binary were not the same. They are set by the
`installer/release.sh` and by using `sdk build (installer |
git-and-installer)` commands, which created this discrepancy.

Create two macros, `FILE_VERSION` and `PROD_VERSION` to store File and
Product version of the included binary and copy it to the installer
file.

Closes: git-for-windows/git#1797
Signed-off-by: Rohit Ashiwal <[email protected]>

Author: r1walz

installer/install.iss

@@ -42,6 +42,7 @@ SolidCompression=yes
 SourceDir={#SOURCE_DIR}
 #else
 SourceDir={#SourcePath}\..\..\..\..
+#define SOURCE_DIR SourcePath+'\..\..\..\..'
 #endif
 #if BITNESS=='64'
 ArchitecturesInstallIn64BitMode=x64
@@ -50,13 +51,17 @@ ArchitecturesInstallIn64BitMode=x64
 SignTool=signtool
 #endif
 
+#define FILE_VERSION GetFileVersion(SOURCE_DIR+'\'+MINGW_BITNESS+'\bin\git.exe')
+#define PROD_VERSION GetStringFileInfo(SOURCE_DIR+'\'+MINGW_BITNESS
+				+'\bin\git.exe', 'ProductVersion')
+
 ; Installer-related
 AllowNoIcons=yes
 AppName={#APP_NAME}
 AppPublisher=The Git Development Community
 AppPublisherURL={#APP_URL}
 AppSupportURL={#APP_CONTACT_URL}
-AppVersion={#APP_VERSION}
+AppVersion={#PROD_VERSION}
 ChangesAssociations=yes
 ChangesEnvironment=yes
 CloseApplications=no
@@ -73,11 +78,7 @@ PrivilegesRequired=none
 #endif
 UninstallDisplayIcon={app}\{#MINGW_BITNESS}\share\git\git-for-windows.ico
 #ifndef COMPILE_FROM_IDE
-#if Pos('-',APP_VERSION)>0
-VersionInfoVersion={#Copy(APP_VERSION,1,Pos('-',APP_VERSION)-1)}
-#else
-VersionInfoVersion={#APP_VERSION}
-#endif
+VersionInfoVersion={#FILE_VERSION}
 #endif
 
 ; Cosmetic