Solaris version update.

INSTALL

@@ -51,7 +51,7 @@ PostgreSQL has been tested on the following platforms:
    linux          Intel x86 on Linux 2.0 and Linux ELF
                   SPARC on Linux ELF
                   (For non-ELF Linux, see LINUX_ELF below).
-   sparc_solaris  SUN SPARC on Solaris 2.4
+   sparc_solaris  SUN SPARC on Solaris 2.4, 2.5, 2.5.1
    sunos4         SUN SPARC on SunOS 4.1.3
    svr4           Intel x86 on Intel SVR4 and MIPS
    ultrix4        DEC MIPS on Ultrix 4.4

doc/FAQ

@@ -163,7 +163,7 @@ Section 1: General Questions
      * irix5 - SGI MIPS on IRIX 5.3
      * linux - Intel x86 on Linux 1.2 and Linux ELF (For non-ELF Linux,
        see LINUX_ELF below).
-     * sparc_solaris - SUN SPARC on Solaris 2.4
+     * sparc_solaris - SUN SPARC on Solaris 2.4, 2.5, 2.5.1
      * sunos4 - SUN SPARC on SunOS 4.1.3
      * svr4 - Intel x86 on Intel SVR4 and MIPS
      * ultrix4 - DEC MIPS on Ultrix 4.4