GetPrerequisites: match ldd output on Solaris

Solaris output is the following:

```
$ ldd /lib/libxml2.so
libz.so.1 =>     /lib/libz.so.1
libm.so.2 =>     /lib/libm.so.2
libc.so.1 =>     /lib/libc.so.1
```

While on Linux

```
$ ldd /usr/lib/libxml2.so
linux-vdso.so.1 (0x00007ffe02bbe000)
libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f03ab852000)
libicuuc.so.64 => /usr/lib/libicuuc.so.64 (0x00007f03ab67a000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007f03ab463000)
liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f03ab23d000)
libm.so.6 => /usr/lib/libm.so.6 (0x00007f03ab0f7000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007f03aaf34000)
/usr/lib64/ld-linux-x86-64.so.2 (0x00007f03ab9fd000)
libicudata.so.64 => /usr/lib/libicudata.so.64 (0x00007f03a94ee000)
libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f03a94cd000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f03a92e5000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f03a92cb000)
```

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/GetPrerequisites.cmake b/Modules/GetPrerequisites.cmake
index 2beea00..57ae446 100644
--- a/Modules/GetPrerequisites.cmake
+++ b/Modules/GetPrerequisites.cmake
@@ -729,7 +729,7 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa
 
   if(gp_tool MATCHES "ldd$")
     set(gp_cmd_args "")
-    set(gp_regex "^[\t ]*[^\t ]+ => ([^\t\(]+) .*${eol_char}$")
+    set(gp_regex "^[\t ]*[^\t ]+ =>[\t ]+([^\t\(]+)( \(.+\))?${eol_char}$")
     set(gp_regex_error "not found${eol_char}$")
     set(gp_regex_fallback "^[\t ]*([^\t ]+) => ([^\t ]+).*${eol_char}$")
     set(gp_regex_cmp_count 1)