git: update to 2.6.3

Signed-off-by: Luka Perkov <luka@openwrt.org>

net/git/patches/300-configure_for_crosscompiling

@@ -1,6 +1,6 @@
 --- a/configure.ac
 +++ b/configure.ac
-@@ -844,7 +844,8 @@ AC_RUN_IFELSE(
+@@ -867,7 +867,8 @@ AC_RUN_IFELSE(
  		FILE *f = fopen(".", "r");
  		return f && fread(&c, 1, 1, f)]])],
  	[ac_cv_fread_reads_directories=no],
@@ -10,7 +10,7 @@
  ])
  if test $ac_cv_fread_reads_directories = yes; then
  	FREAD_READS_DIRECTORIES=UnfortunatelyYes
-@@ -878,7 +879,8 @@ AC_RUN_IFELSE(
+@@ -901,7 +902,8 @@ AC_RUN_IFELSE(
  		  if (snprintf(buf, 3, "%s", "12345") != 5
  		      || strcmp(buf, "12")) return 1]])],
  	[ac_cv_snprintf_returns_bogus=no],
@@ -20,7 +20,7 @@
  ])
  if test $ac_cv_snprintf_returns_bogus = yes; then
  	SNPRINTF_RETURNS_BOGUS=UnfortunatelyYes
-@@ -901,7 +903,8 @@ yippeeyeswehaveit
+@@ -924,7 +926,8 @@ yippeeyeswehaveit
  #endif
  ]),
  	[ac_cv_sane_mode_bits=yes],